Why doesn't the Fly phone see the SIM card? Reasons why the phone does not recognize the MTS SIM card. Hardware problems

A SIM card is a necessary part of any cell phone. Without a SIM card, as we call it in modern times, it is impossible to send and receive messages and calls. Unfortunately, no one is immune from a situation where a SIM card suddenly stops working. Or, for some reason the new SIM card refuses to be friends with the phone. The phone immediately reports this problem, asking you to insert a SIM card, although it is already inside.

Action plan:

What to do in such a situation? How to find out, why is the sim card not working?? Below is a detailed action plan.

1. Open the phone, inspect the SIM card, evaluate its location in the slot. Perhaps the SIM card has moved slightly, so its contact with the phone is lost. If in your phone the SIM card needs to be inserted under the battery, and not into the card reader next to it, then there is a high probability that the contacts of the SIM receiver and the SIM card simply do not touch. Try pressing the SIM card to the slot using a small sheet of paper folded several times. Place the folded sheet between the SIM card and the battery and reassemble the phone. Perhaps contact between the parts will be restored and the SIM card will start working again.
2. Carefully inspect the contacts of the SIM receiver and SIM card. Are they dirty? They may be the reason why SIM card stopped working. Wipe the visible contacts with a regular eraser, return the SIM card to its place and reassemble the phone. Works?
3. Bend the SIM card slightly so that the side with the contacts is convex. With prolonged use, the SIM card heats up and becomes deformed, and then the SIM card contacts do not reach the slot.
4. Insert another SIM card into your phone. The best option There will be a SIM card of another operator. If it works, then the problem is with your SIM card: it is faulty. If the phone does not see the new SIM card, it means that the problem lies with it.

Why did it happen so?

In a conflict between the SIM card and the phone, as a rule, one of them is to blame.

If the phone is to blame

• Some phone models are “locked” for a specific operator, so such a phone simply will not see a “non-native” SIM card.

• With cell phones with two SIM cards, it often happens that SIM card slot does not work when the second one is working. Therefore, when inspecting the phone, you should insert the “doubtful” SIM card into both the first and second slots.

• Some physical damage can have a detrimental effect on the phone's performance. For example, if water gets on the device (it fell into a puddle, or it rained on it), over time the contact between the slot and the SIM card will be broken due to oxidation. You can try to solve this problem yourself: disassemble the phone and wipe with a napkin the joints of the cables responsible for the communication module. If even after cleaning the SIM card does not work, then you will have to take the phone to the service center and repent there that you didn’t look after your little friend.

Please note that the phone does not immediately respond to physical damage such as being dropped or exposed to water. It works as usual for a while, but later breaks down. Therefore, if you have a phone in your hands that does not see a SIM card, try to remember if your friend had to endure any troubles. Even a sudden change in temperature is detrimental to the operation of a SIM card. You bring your phone from a cold winter into a warm house, and moisture condenses inside the device. The solution here is simple: disassemble the phone, remove the SIM card and wipe it with a soft cloth.

If it's Sim's fault

• Some SIM cards have an expiration date. If a SIM card is not used for a long time, it becomes blocked and turns into a useless plate. Also, the SIM card may be blocked due to a negative balance. Each operator has its own rules, and you need to know them.

• Some operators cellular communications allow SIM card activation only after the first paid action. As a rule, when purchasing a SIM card, you are informed about its correct activation.
• Many modern touchscreen phones use a cropped SIM card rather than a full-size one. Sometimes owners of iPhones and other mobile devices cut the SIM card on their own, and then discover that cut SIM card does not work. Perhaps the reason lies in improper pruning, so it is better to entrust this process to specialists in service centers. But first, if you mini sim card not working, inspect it for contamination, restart the phone. The same inspection should be carried out if micro sim card not working. After all, there remains hope that you can solve the problem yourself.

We contact operators

Every mobile operator is interested in the loyalty of its customers, so in almost all cities there are service centers where you can contact with your problem.

If your smartphone does not read the SIM card, you should immediately find out why the phone does not see the SIM card. After all, if the card is not active, then the mobile device becomes practically useless, because it is simply no longer capable of performing its main function. The causes and ways to eliminate such problems are worth considering in more detail.

Why doesn't the SIM card work?

Many users have encountered a similar problem: the SIM card stopped working or was immediately inactive after being installed in a communication device. There may be two options: either the phone does not initially recognize the SIM card, or at some point it simply stopped seeing it for a reason unknown to the user.

No one is immune from such problems, so it’s worth considering everything right away possible reasons occurrence of this situation.

Possible causes of the problem

Typically, such situations arise for the following reasons:

• The SIM card does not adhere to the contact. It often happens that the size of the SIM card does not correspond to the capacity of the slot (for example, if an employee of the corresponding center cut the card incorrectly), or the latter simply becomes loose due to mechanical damage. In such cases, the mobile device writes that the SIM card was not detected.

Mobile device slot capacity

• Low speed device boot. If on this moment The phone has a huge number of installed various programs and applications that are activated when the smartphone is turned on, it detects the SIM card more slowly. In this case, the SIM card will definitely be accepted sooner or later, the user will just have to wait a few minutes.

• Dirt on contacts. During operation, the communication device periodically becomes dirty. The user can clean the outer part of it from dust and other things, but a certain part of the dirt remains inside the phone. There are also situations when it accumulates on the contacts, which prevents the smartphone from connecting a SIM card.

• Damage on the map. It also happens that the SIM card turns out to be damaged. The fault may be scratches, splits, manufacturing defects, etc. But one way or another, if the problem is in the SIM card, then it will need to be replaced. Some mobile operators In this case, they can duplicate your SIM card for free, without losing the number and information on it.

• Damage to contacts. This happens when the user frequently moves the card. The culprit will be mechanical damage, which cannot be avoided due to careless operation of the device. In this situation, only urgent repairs will solve the problem.

How to solve a problem?

In most cases, the problem is completely solvable, without the intervention of repairmen or the operator mobile communications. And if this is your situation, then one of the following options will help you:

• Reboot your mobile. When you turn it on, wait until the device boots up completely. Sometimes this needs to be repeated several times. If the card is still not detected, then you should turn off the phone. Remove the SIM card from it and reinsert it. After that, reboot.

• Wipe all contacts on the phone (we are especially interested in the SIM card slot) and the card with a soft rag or rubber cloth. Just be careful not to damage anything. This will eliminate all contamination, and if the card was rejected by the device precisely because of them, then this will solve the problem.

• Take a small piece of paper, and insert it into the card slot, along with the SIM card. It is important that at the same time the SIM card fits tightly to the contacts.

If the problem is with the phone itself

The problem may be with your smartphone, and not with the SIM card. It's quite easy to check - just insert the card into another device.

If it works successfully, then it’s worth solving the problem with the phone.

AND it could arise for one of the reasons listed below:

Video on the topic:

Troubleshooting after flashing

After unsuccessful firmware installation, many problems may arise, including problems with reading the SIM card.

However, this is easy to fix thanks to the following steps:

1. Restore the modification according to the standard model.
2. Return serial number (IMEI).
3. Restore the original configuration.
4. Take the device for repair.

It will be useful to view:

Incorrect firmware can be easily corrected by a service center specialist, but trying to solve the problem yourself is not recommended. After all, in this case, you risk repeating history or even irreversibly damaging your phone.

And an experienced technician will be able to set up a smartphone without any questions in less than an hour, while also providing you with a guarantee of stable operation of the mobile device in the future.

If there is a problem with the SIM card

So Alternative option- problems with SIM card. In order to check this, you need to insert a second SIM card into the phone, and insert the supposedly faulty one into another device.

If the other SIM card is read by the phone without any problems, but the previous one cannot be seen even by another communication device, then the problem has definitely arisen in the card.

A the reason may be as follows:

• The SIM card has expired. A standard card can work for no more than 180 days if no one uses it. After this period, it is automatically blocked and it will be impossible to use this SIM card in the future.
• Card not activated. Some mobile operators offer to get their SIM cards for free. However, when it is inserted into the device, the user may be faced with an unpleasant surprise - the card simply does not work. But the fact is that the SIM card needs to be activated. How exactly this can be done needs to be clarified with your operator.
• Mechanical damage. Incorrect cutting, scratches, broken contacts, severe abrasions, splits, etc. - all this is considered mechanical damage, after which the SIM card will not work or will not function properly.

At the same time, they understand that the subscriber would not want to lose his number, the options installed on it, saved contacts and funds that remain on his balance.

Therefore, certain cellular companies offer users the opportunity to make a duplicate, with the same information, which was contained on the previous card:

• Megaphone. Call 0500 (support service) and tell us why your card stopped functioning. After this, the operator will clearly tell you what actions to take to solve this problem in the future.
• MTS. Dial 8-800-250-0890 and follow the voice menu instructions. It describes in detail how exactly you can restore the card to working order.
• Beeline. Call 0611. Tell us about the situation, after which the operator will fill out an application to restore the SIM card.

If you suddenly notice that the Megafon SIM card does not work in your phone, do not get upset ahead of time. A problem can have several causes - and it can be solved in almost every case. Just remain calm, do what the instructions tell you to do, and the ringing function will be restored.

The performance of a SIM card is influenced by 6 main factors.

• Technical malfunction. The most obvious, but not very common reason. The devices, the slot, or the module itself may be faulty.
• Incorrect network settings. Most phones receive settings in automatic mode, which leaves little risk of errors.
• Lack of stable signal. In this case, the phone sees the SIM card, but it is impossible to use it. The solution to the issue is simple - go to a place where the connection is fully functioning.
• Insufficient funds. The module finds the device, all the bars in the antenna indicator are in place, but you still can’t make calls or access the Internet. The reason for such troubles lies in the negative balance.
• You have left MegaFon's coverage area. The company does not cooperate with some operators; the usual services are not always available in roaming.
• Just bought a SIM card. It takes time for the module to register on the network. Just wait and everything will work out.

If none of the answers to the question “why doesn’t the Megafon SIM card work in the phone?” does not suit your case, contact the company's offices. Our specialists will help you figure out the problem or offer to replace the product.

How to find out if the Megafon SIM card is working

First you need to exclude the most obvious. Go to a place with a stable signal and move the module to a working device. A working SIM card will register on the network and provide access to familiar functions. If this does not happen, replace the module.

The Megafon SIM card in the phone does not work: what to do?

As soon as you discover that the SIM card does not work in your phone, Megafon suggests following the 5-step instructions.

1. Check the amount of money in your account. If the balance is negative, cover the debt so that the amount of funds necessary to complete transactions remains in the account.
2. Look at the signal strength indicator. Missing - try changing location.
3. Go to your mobile settings. Look at the network parameters, select from the available MegaFon networks, change the standard if possible - from 4G to 2G or 3G and vice versa - and reboot the device. If still does not work, repeat the action with a different standard.
4. Remove the module from the smartphone. Inspect the SIM card for damage or dirt. Wipe with a dry natural cloth or regular eraser. Insert back.
5. Change the position of the module. It may be inserted incorrectly or the contacts are coming off. In the latter case, you should try pressing the card against the phone or bending it slightly so that the contacts touch.
6. Insert a module from another operator into your device. At the time of the operation, MegaFon may have communication problems. Someone else's SIM card will determine if there is a problem with the phone.

The new Megafon SIM card does not work

The newly purchased, new module is inactive. The SIM card starts working on average within 24 hours after purchase, but in some cases the wait may take up to 3 days. If after some time the services are still unavailable, you can sound the alarm. Contact the company, specialists will be able to help, or try to activate the card yourself.

They do this in 3 ways:

• On your phone keyboard, enter the command consisting of *121*PUK code*non-activated phone number#. Press call. The command can be sent from another cell phone, the main thing is to indicate the code and number.
• Go to the MegaFon website. In the upper right corner find Personal Area and log in with your new number. As soon as you register and confirm ownership of the contract, the module will be activated.
• Contact Support. Call 0500 or 8 800 550-05-00, wait for a response from a specialist and express your desire to activate the SIM card. Please note that at the call center the subscriber is asked to confirm his identity by providing his passport details.
• Visit the offline office. Return to where you purchased the module, or go to the nearest operator's branch. Don't forget to take your passport, it will be required during activation. Eckeuf is free.

SIM card "Megafon" does not work: only emergency call

Do you think that the Megafon SIM card has stopped working in your phone, since only emergency calls are available? Pay attention to whether the device sees the module. This can be done using the inscriptions on the screen. If you notice something like “No SIM card,” then you should remove the module and try to insert it again after cleaning and checking the contacts.

Inscriptions in the spirit of MegaFon or “Operator-2” say one thing: the SIM card is working, the phone sees it, but the coverage does not allow making calls to other subscribers. Change your location. The ability to make a call may not be possible even in familiar territory when there is interference from thick walls or buildings in dense buildings.

If communication problems constantly arise, go to your personal account and chat with a specialist. You will be asked to provide an address where only emergency calls, and describe the conditions in as much detail as possible. On smartphones under Android control Information about uneven coverage can be sent automatically by installing the My Network application.

The SIM card is the most important part in any cell phone, since without it the phone cannot be used for its intended purpose. The user will be deprived of the ability to send and receive messages, as well as call anywhere other than the emergency service. Unfortunately, no one can predict the breakdown or malfunction of a SIM card; sometimes such moments come at the most inopportune time. It also happens that the phone does not detect the card and informs the owner about this, demanding to insert the card into the slot in which it is already located. You can learn what to do in such situations from this article. Several action plans for different situations are detailed below.

How can I find out what is causing the SIM card to malfunction?

The first thing you should do is remove the card from the slot, having first examined its location. It is quite possible that the SIM card has moved a little, as a result of which contact with the phone was lost. In the case when the SIM card slot is located under the battery and not next to it, there is a possibility that the SIM receiver does not contact the card through special micro-contacts. To solve the problem, you should try to press the SIM card more tightly to the slot, using a small roll of paper folded several times. You need to place the package between the card and the battery, and then assemble the phone. It is likely that contact will be restored and the SIM card will function again.

If this does not help, remove the card from the SIM receiver again and carefully inspect all contacts. Are they damaged or dirty? This may be the reason why the card does not work. Take a simple eraser and wipe all visible contacts, then insert the card into the slot and start the phone. Works?

Not again? Then bend the SIM card slightly so that the side on which the contacts are located becomes slightly convex. The reason may be that with prolonged use the SIM card overheats and begins to deform, as a result of which the contacts of the slot and the card do not touch.

Card still not working? Then the problem may lie in the phone itself. To check, insert a card from another operator into your cell phone. If it works, then the problem is in your first SIM card, if it doesn’t work, then the problem is in the SIM receiver.

Why doesn't the SIM card work?

The reason may be in the phone itself, some cell phones are “locked” exclusively for a specific mobile operator, therefore a similar phone will not detect another SIM card. It often happens that in phones with two SIM cards only one of the inserted cards works. Therefore, you should inspect both slots and insert a “suspicious” SIM card into both the first and second.

Many physical damages greatly affect the operation of a cell phone. For example, if water gets on the phone, after a certain time the contacts of the SIM card or slot may oxidize, which will lead to a malfunction. Regardless of whether your phone has fallen into a puddle or been caught in a light rain, and it seems that water has not penetrated under the case, you should disassemble the device and easily wipe the contacts and places where the cables connect with a napkin. If after cleaning the SIM card still does not work, then the only correct solution is to contact a service center, where specialists will solve the problem in a short time.

Take into account the fact that the damage will not show up immediately. After a certain period of time, the phone may suddenly break down, although it would seem that before that it worked perfectly without the slightest suspicion. Even a sharp increase or decrease in temperature can be detrimental to a SIM card or connector. You come in from outside where the weather is cold or humid and find yourself in a warm room, unaware that liquid is condensing inside the phone. Everything is extremely simple: disassemble the phone, remove the SIM card and wipe it with a soft, dry cloth.

What to do when the SIM card is to blame for the problem?

Some SIM cards have a certain expiration date indicated on the starter package; when purchasing, pay attention to the packaging, it may indicate the period of use. If inactive for a long time, the card is automatically blocked or fails, turning into useless garbage. Also, the card may be blocked due to a negative balance maintained for a long time. Each operator sets its own rules that you need to know to avoid problems. Most mobile networks will activate your SIM card only after the first top-up. Often, when purchasing a card, a consultant will inform you on how to properly activate it.

Many modern smartphones have slots that only accept cut-off cards called mini-SIMs. Often, owners of iPhones and other smartphones are forced to cut the SIM card themselves, which can cause damage. This action You should trust specialists in special centers, or, in extreme cases, people who have previously successfully cut SIM cards and have valuable experience. But still, when the SIM card does not work, you should do the above steps and make sure that you cannot solve the problem yourself.

Contact your mobile operator if you have a problem with your SIM card

Various problems with a smartphone or tablet can result in the device not seeing the SIM card.

It is clear that under such conditions it is impossible to use it for its intended purpose - calls cannot be made, instant messengers, some applications cannot be used, or access to the Internet (except for using the Wi-Fi format).

In this material we will answer the question why the phone does not see the SIM card, and how to fix this problem.

Manifestation

How can you understand that the device is unable to read a SIM card? To check the functionality of the port, you need to install a card in it and reboot the phone.

This is necessary because some devices support hot card swapping (that is, when turned on), while others do not (that is, they are able to recognize and “see” new map only after reboot).

As soon as the reboot is complete, the phone tries to detect the SIM card and find the network. Some phones (mainly budget Asian models) need some time for this (no more than 2-3 minutes). At the same time, during this time the device can show a crossed out card icon and an “offline” notification, but after a maximum of 5 minutes the SIM card should be detected.

If after five minutes nothing has changed and the “offline” notification has not disappeared, then the device does not see the SIM card; the problem can occur on any device, both with and without hot-swappable support.

Moreover, in the first case, the network may not be detected only after a “hot” replacement, or only after a reboot.

In the case of dual-card devices, only one of the two ports may not work.

Reasons and solution

This problem can occur for a number of reasons. But all of them can be divided into two large categories:

• Related to the SIM card itself, that is, its inoperability (or inoperability in a given device);
• Related to the device (smartphone or tablet).

In this case, problems of the second category can also be divided into two groups.

Hardware failures are associated with the physical inoperability of the port itself (for example, when the contacts on it are oxidized or filled with liquid).

Software problems are due to the fact that the device software is not designed to work with a certain type of SIM card.

Device problems

Sometimes you can fix them yourself, others require service repairs or complete replacement of this component.

To determine the presence of a SIM card in the phone, several hardware components are used - a SIM connector, the port itself, and contact pads. Failure of any of these components leads to malfunction. This means that the reasons on the part of the device can be very diverse.

Operator lock

The main hardware problem that your device may have is its firmware for a specific operator.

Most often, this is typical for mobile devices ordered from abroad and not intended for sale on the Russian market.

This happens because for residents of the country of production the device is supplied immediately “complete” with very favorable tariff one or another operator (often, even the final price of the device depends on this).

Previously, this problem occurred on most iPhones that were not accredited by Rostest and were not certified for sale in the Russian Federation.

Now a similar difficulty is encountered in some Asian and European phones.

This problem almost always occurs when the device costs 2-3 times less.

“Unlocking” the phone and reflashing it must be carried out by specialists, which also costs money, so the savings in this case are questionable. In addition, the outcome of the procedure is not always satisfactory - it depends on the individual characteristics of the blocking and the device itself. In some cases, unlocking is simply impossible; in others, the procedure completely destroys all original software.

OS problems

SIM connector software failure is a common problem that occurs from time to time on all phones.

This situation can be recognized by a number of indirect signs:

• Have you recently reflashed your phone?
• Have you recently installed software (not necessarily pirated - official programs sometimes they also cause such a failure), during which it is necessary to establish contact with the memory card;
• Have you recently installed updates (especially if it was done over Wi-Fi).

All these actions can cause failures if operating system, its components, updates or programs were not installed correctly.

Most often you can solve the problem yourself.

Do a few things:

• Turn off the phone, remove the SIM card, insert it again and start;
• Delete the latest installed applications, and then “cold” reinstallation of the SIM card (with the device turned off);
• Restore to factory settings.

If none of this helps, you can try to reflash the phone.

Important! As in the case of blocking the device “for the operator,” this phenomenon cannot be the reason for the disruption of only one slot on a two-card phone. If operator lock or any other problems with software occur on a two-card device, then the card is not seen by any of the slots.

Slot clogged

If debris gets into the card slot, the contacts are not in full contact with the card contacts, and therefore no connection occurs.

Clogging can occur:

• When using the phone for a long time, dust gets inside it (and the case is only slightly able to delay the onset of this problem);
• Even if the device falls once into the sand or onto the ground;
• With frequent rearrangement of SIM cards;
• When you frequently open the phone's cover, with open slots at the back of the device.

In principle, you can try to fix this problem yourself.

To do this, it is enough to thoroughly blow out the slot with a hairdryer with cold air (you cannot heat the device), but it is important to do this in such a way that dust does not get into other parts of the device.

After which the contacts can be wiped with a non-woven material wound on a needle and soaked in alcohol.

Physical damage to the slot

Damage to the card slot is a more serious problem, and it will most likely not be possible to fix it yourself using available means.

It occurs if:

• The phone was dropped, thrown, subjected to pressure;
• The SIM card was often rearranged, and this was done quickly and inaccurately;
• The slot itself was subject to pressure, for example, when removing the device cover or when removing the battery.

Even if you know the exact cause of the slot damage, you are still unlikely to be able to fix the problem yourself. It is better to contact a service center for this, since only a specialist can determine the nature of the damage and the most optimal way to eliminate it. In some situations, only minor repairs can be made, while in others, a complete slot replacement is required.

Cardholder damage

What is a card holder? Strictly speaking, this is a functional part of the SIM card installation slot, which is available only on those phones in which the slot is hidden under back cover and/or a battery, but not for those whose slot “exits” from the side.

That is, technically, with this type of slot the card holder also exists, but it is located in the device body, not visible to the user, and it is very difficult to damage it unintentionally even if the device is dropped.

Cardholder- this is the metal frame above the contact pad, the frame into which you directly insert the card.

Depending on the model, it may flip up and slam shut once the card is inserted, or you may be able to “slide” the card directly into the card holder while the card holder itself remains static.

What functions does this device perform?

• Ensures that the plastic card is held in place;
• Presses it, ensuring the tightest possible contact between the contact pads of the slot and the card (which is especially important if a smaller format card is installed in a slot for a larger one).

Accordingly, damage to the holder prevents the normal fastening of the SIM card.

It may not be inserted at all or remain movable inside the frame. But the most common occurrence is the provision of insufficiently complete contact between the relevant sites.

The device can be damaged by falling, careless opening, or removing the card.

Most often, breakdowns are obvious - the device is quite fragile and can be easily broken off or bent when opening.

In this case, you can try to straighten it yourself.

However, more often the problems are more complex, for example, loosening of the sash holders (in models where it tilts up).

It is impossible to fix such a problem yourself without special equipment, so it is recommended to contact a service center.

Repair services for this part of the device are in most cases not too expensive. It almost never requires complete replacement.

Oxidation of contacts

The problem is quite serious. With it, the contact pads of the slot are subject to oxidation.

In this case, the visual severity of the phenomenon cannot be a diagnostic sign.

Sometimes visually strong oxidation (darkening) does not interfere with operation, while sometimes almost no external changes are noticeable, but the slot does not work.

Oxidation may occur for many reasons:

• Flooding or getting wet (even use in the bathroom or in the rain, in a humid environment);
• Excessive heating, overheating of the device;
• Problems with the device's battery;
• Sometimes oxidation occurs on old phones over time, since their service life has long expired.

To determine the presence of oxidation, inspect the contacts if possible.

Usually, a slight darkening is noticeable on them, but such a “symptom” may be absent. You can try to eliminate oxidation yourself.

To do this, soak a non-woven material in alcohol, wrap it around the needle and gently wipe the contacts.

Let them dry, insert the SIM card and try to start the phone. Sometimes this repair method is quite effective.

In some cases, oxidation turns into corrosion. You will not be able to fix the problem yourself, since it requires replacing the entire slot. This is an expensive procedure performed by professionals.

Broken card reader

The card reader is otherwise called a SIM connector. This is a technically complex device that actually transmits the signal from the slot contact pads to the device processor.

That is, in fact, it depends on it whether your device sees the SIM card or not.

The connector circuit consists of many elements - capacitors, varistors, resistors, etc.

And a breakdown in any of these components leads to the slot stopping working.

And it is quite easy to damage any part of it - just a fall, moisture, dust, overheating, etc.

It is impossible for the average user to determine this phenomenon visually, and the service requires lengthy diagnostics to understand which section of the circuit is damaged. Repairing a chain can usually be quite complicated and expensive, which is why technicians often suggest replacing the connector completely. This is also not cheap, but there is no other solution - it is impossible to repair the device yourself.

Damage to contacts

Another unfavorable phenomenon that requires slot replacement is mechanical damage to the contact pad.

This can happen when grains of sand or grains of earth get into the phone, or when you try to remove the card more easily using foreign objects.

Theoretically, you can even damage the contact with your fingernail when folding the card holder.

The damage may or may not be visually noticeable, such as a scratch or deformation. Eliminating the phenomenon is difficult, and often requires replacing the slot (in rare cases, a damaged contact).

Soldering failure

Failure to solder the card holder contacts is typical for phones with a retractable slot.

The cause of soldering failure may be a fall, moisture, compression, or careless removal/insertion of the SIM card.

The problem is solved in the service by soldering the contact pins of the card holder - the procedure is not too complicated or expensive.

Deformation of SIM holder contacts

Deformation of the card holder contacts is not externally noticeable (unlike the deformation of the card holder itself).

The causes of deformation are the same: careless operation, pressure on the slot, falling of the device or a blow to it.

The problem can also occur when you try to install a nano format card into a micro format connector, and when you try to “hot” swap a SIM card on a phone that does not support this function.

The problem is also solved in the service. During repairs, contacts can be restored or replaced.

Problems with SIM card

Such difficulties are much easier to eliminate than those described in the previous section.

Strictly speaking, the most in a simple way The solution to the problem is to replace the card at the office of your mobile operator.

By presenting the documents of the person to whom the number was registered, you can receive a new card for free, preserving the number, tariff, balance, and other data.

If the slot and other hardware components of the device are working properly, but the card is not detected, then there is a problem may be as follows:

• The card has expired or has been blocked after a long period of non-use - contact the operator and find out why the card is blocked and whether it can be unblocked;
• A new, just purchased card may not be activated - the problem is especially typical for many foreign SIM cards, and can be solved by calling or sending an SMS to a specific number;
• The map is still quite complex technical device, therefore it can also be damaged - the contacts oxidize when poured, break when pressed, etc.;
• A common cause of failure is unsuccessful independent (and sometimes professional) cutting of the card to micro- or nano-format - in this case, you can accidentally damage its important elements;
• The card becomes dirty as a result of long-term use.

It's quite easy to identify the problem. Flooding, oxidation, breakage or clogging of the card can be noticeable visually, and in the case of clogging at all, cleaning the card and blowing it out helps. In other cases, replacing the SIM card while keeping the number will quickly eliminate any problems that may arise.

Other cases

A special case of the problem is incorrect installation of the SIM card.

In particular, before installation, the user must find out whether his device supports hot-swappable cards, and also carefully monitor whether the card is installed on the wrong side.

There is also a possibility that the card needs to not only be inserted, but also pressed until it clicks.

But besides this, there are also less obvious problems. For example, the SIM card contacts do not connect to the port contacts.

This problem most often occurs when a large map is trimmed to a smaller format on its own - in this case, an error of even half a millimeter can lead to problems.

This can also happen when a nano-SIM is inserted into a micro-SIM port (or a micro-SIM into a regular one). In this case, the card will work, but it must be installed correctly, exactly hitting the contact areas. Sometimes in such a situation, the card may move when moving the phone, but the problem is easily solved by placing a sealant (paper, cardboard) between its top and the top of the port.

Conclusion

If the phone does not see the SIM card, this can be the cause of either a serious breakdown or a minor problem or inconvenience, such as the SIM card being blocked.

If the phone sees another card, then it is obvious that there are no problems with it.

Before purchasing a phone abroad, you should check in advance whether it will work normally with your mobile operator.

If you discover a serious breakdown, you should not try to fix it yourself if you do not have enough skill and suitable tools.

It is better to seek help from specialists so as not to further damage the device with your incompetent actions.