Simka sees, but the network does not catch | Peekaboo

Why doesn’t my Android phone see the SIM card?

The reasons why the phone does not see the SIM card are related to the damage to the IMEI number.

NVRAM is damaged (Incorrect IMEI). This situation occurs quite often on smartphones and you can check it as follows:

• Turn on Wi-Fi and check for available networks to connect to;
• If the first network that appears in the list of available connections is “NVRAM WARNING: Err = 0x10” or something similar, then the NVRAM is damaged
  .
• We dial the combination *#06# on the call keypad and see empty fields under the name IMEI 1 and IMEI 2;

What is IMEI? This is a special identifier for your phone, without which you will not be able to make calls or send messages. It is located in NVRAM.

The reasons are as follows:

What to do if the problem is in the SIM card

When the smartphone has no visible damage, the problem may be in the SIM itself. Most often, they occur if the owner of the gadget has not used the SIM card for several months: some operators block numbers in such cases. To unblock it, you may have to visit the company’s office and write a statement, as well as pay money for restoration.

What to do if the SIM card stops functioning:

• If the nano card was cropped to turn into a “micro” card unsuccessfully, you should check it in another smartphone. If the assumption is confirmed, you should order a reissue from the operator.
• The SIM card contacts are clogged. In this case, it is recommended to carefully clean them with a regular eraser to remove dust and other contaminants.
• Check with your service provider to see if the number is blocked. This is definitely worth doing after several months of not using this number.
• You need to activate the sim. This happens after purchasing new plastic. To activate, just top up your balance or call a specific number: the procedure depends on the conditions of a particular operator.

What ordinary users and third-party Internet resources advise

So, we have learned the recommendations that manufacturers and developers suggest using. But there are also tips that are offered by ordinary people. And they are usually prepared based on actual tests. And getting real results. Therefore, it is also worth talking about them, since it is precisely such recommendations that are often very effective.

For example, one of the users talked about how he was able to solve a similar problem with the lack of notifications on his Huawei P20 Pro:

Another recommendation from owners of similar phones is to completely remove software that has stopped functioning normally. And then — return it using a new installation. As practice shows, this operation is often enough for the program to start sending notifications normally again.

Also, many owners of modern mobile phones use a product such as Clean Master on their devices. And one of the users noticed that after installing this tool a problem began to arise. He went into the program settings. Selected “clear notifications”. Set it to «Off». And everything became normal.

It turns out that this program, in its original mode, simply deleted notifications. And they simply did not reach smartphone owners!

Another way was found on the Internet. Or rather, it is an addition to the official instructions from Huawei technical support.

And it consists of the following:

1. Check the necessary settings and carry out all the necessary actions according to the official instructions-recommendations, depending on the version of the Android operating system and the proprietary shell.
2. Additionally, go to the list of applications. And limit the rights to those options that are used very rarely. Or even get rid of them by deleting them.
3. Launch all critical programs one by one. At the top of the window you will find a padlock icon. Click on it. This will ensure that the applications you need will always remain in the phone’s RAM. And it won’t close accidentally. For example, if the user decides to clear memory.

Why can’t my Samsung phone see the SIM card?

What should you do if your recently purchased Samsung phone no longer recognizes the SIM card and, as a result, you cannot make calls? What do you need to do with your Samsung phone to make your SIM card from your mobile operator work again? Let’s try to figure it out.

There are main failures due to which Samsung phones cannot see SIM cards:

Hardware

• Oxidation of telephone contact;
• Microcircuit failure;
• Broken or damaged telephone board;

Software failure

The surest way to identify a hardware problem is to insert another (new) SIM card. If the other (new) SIM card is not visible, then the problem is in the phone. Try checking your phone for dirt and water. If everything is clean and the device is otherwise functioning, then this is a hardware failure and it is better to contact a service center.

To identify and resolve the problem, follow these steps.

1. Make sure your phone is not in Silent mode.
2. Make sure your phone is enabled to receive notifications.

   Open the application Settings
   , go to section Applications
   , select Messages
   , click Notification Manager
   and enable the function Allow notifications
   . If the feature is already enabled, turn it off and then on again.

3. Make sure the mode Do not disturb
   switched off.

   Open the application Settings
   , go to section Do not disturb
   and turn off the function Do not disturb
   .

4. Make sure the function Smart notifications
   disabled (only applies to phones running EMUI 10.X and Magic UI 3.X).

   Open the application Settings
   , go to section Applications
   , select Messages
   , click Notification Manager
   , select the appropriate SIM card and turn off the function Smart notifications
   .

5. If the problem is not resolved, please see the possible causes and solutions below.

Why can’t my meizu phone see the SIM card?

China’s 3G Internet is different from our WCDMA/HSPA, for this reason it is not surprising that in China there are no problems at all with the World Wide Web.

Not long ago, the netmonitor program was downloaded — according to its logs — the 3G Internet may freeze at the moment when your mobile phone can change the base station. It can be either free or close. While in one place, your smartphone can register in both one and another station. As a rule, there are 8 cells connected, everything is in motion.

Therefore, one of the reasons why the Meizu phone cannot see SIM cards is that the communication module is broken or damaged.

In most cases, this is due to a malfunction of the hardware (SIM card, slot):

• The phone fell or got wet; Poor contact of the SIM card;
• Chip is damaged;
• Problems with the SIM card and card reader (these problems can arise if the SIM card does not fit tightly enough);
• Moisture gets into the phone;
• It happens that you buy a gadget at a promotion or cheaper than the nominal value and the seller did not tell you that the phone is firmware for a specific cellular network operator (in this case, SIM cards from other communication providers will not be detected by your device, and you will not be able to fully use a smartphone).

As for the software of this smartphone model, it is slightly different from those that we described. Often it is enough to disable unnecessary frequencies in the engineering menu. To do this, dial the following combination on the call screen *#*#3646633#*#*

Go to “BandMode”/”SIM1”. Next, uncheck the following:

• GSM Mode with:
  — “PCS-1900”,
  — “GSM-850”;
• UMTS Mode with:
  — “WCDMA-DSC-1800”,
  — “WCDMA-CLR-850”;

“operator” lock

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

https://www.youtube.com/watch?v=n60-wqlLjT4

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 “bundled” with a very favorable tariff from 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 not certified for sale in the Russian Federation.

Nowadays, 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 flashing 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.

Check the most obvious

First of all, try simply rebooting your phone. If this does not help, turn it off and remove the SIM card, and then put it back in place.

Although it’s unlikely, check to see if airplane mode is turned on. Wireless and cellular networks do not work there, so it is unlikely that you will be able to make a call. However, modern smartphones will probably tell you this themselves and offer to turn off airplane mode. Otherwise, do it yourself.

On Android

Check the airplane icon in the status bar. If there is one, pull out the notification shade and click on the same icon to turn off airplane mode.

On iOS

Look at the icons in the status bar. If there’s an airplane there, open Control Center and tap the airplane mode button to turn it off.

System failure

Sometimes the smartphone does not see the SIM card due to software failures, flashing or updating. In such cases, you should reset your network settings or perform a hard reset. In the latter case, photos, videos and other data may be deleted, so it is better to save them first.

On Android

Open “Settings” and go to the “System” section. Find «Reset settings» and open it.

Tap “Reset Wi‑Fi, mobile Internet and Bluetooth settings.” Confirm the action by clicking the “Reset settings” button.

On iOS

Launch “Settings” and go to the “General” section. Scroll to the bottom of the list and click Reset.

Select “Reset network settings” and enter the passcode. Click «Reset Settings» to confirm the deletion.

Contact oxidation

Sometimes it happens that even if the contact is installed correctly, there is still no connection. The reason is dust and dirt, oxides from moisture, or wear and tear on the contact pads themselves from frequent card changes. You can fix this as follows.

Remove the back panel of the smartphone or remove the SIM card tray. Clean the gold-plated contacts on the SIM and card reader using an eraser. If the oxidation is very severe, use fine-grained sandpaper. After this, wipe all contacts with a cloth soaked in alcohol to completely clean them.

Contact wear

If the SIM has been frequently moved from one phone to another, grooves may appear on the contact pads. Because of them, the contacts of the card reader are loosely adjacent to the SIM card. This leads to a poor connection and, as a result, unstable operation.

In this case, it is advisable to replace the SIM at the operator’s office. As a temporary solution, you can fold a piece of paper several times and attach it above the SIM card. In phones with a removable back panel, this almost always works flawlessly, but in models with a sliding SIM tray it may not work.

Android 5 emui 3.1 lite

First of all, you need to check:

1. Go through “Settings” to “Notification Center”, select the necessary applications, check if all the necessary items are selected. Pay special attention to the one that concerns the so-called lock screen.
   
2. Go to the “protected background applications” section to activate all the necessary programs in it.
   
3. Visit the “Network Applications” menu – in the same place, in the settings. Activate “data transfer” and “Wi-Fi” for each software.
4. Go to the settings of each of the problematic applications. Check notification transmission activity individually.

After this, you need to perform three more mandatory actions:

imei recovery

Why doesn’t my phone see the SIM card? 8 ways to solve the problem for all operators | 2020

The phone may not see the SIM card after the update. In order to fix this, you need to do the following:

• Reflash the device via a computer;
• Install a patch for communication via TWRP Recovery;
• Perform a factory reset.

If you change cards too often

Repairing a damaged SIM card slot

There are no things in the world that are not subject to wear and tear. The SIM card slot contains spring elements that ensure reliable contact, and if the elasticity of the material has deteriorated, the play will cause periodic loss of communication. Try placing a piece of paper over the card to secure it in the tray.

If you have access to the slot, i.e. you can see what’s inside, then look carefully at the contacts: are there any noticeable bends or deformations? It is highly not recommended to set something yourself, but if you need to make an urgent call, try prying them with a needle and pulling them up.

Slot dirty

Dust and water easily penetrate even the smallest gaps; it is possible that during rain or in a dusty room foreign objects entered the card tray (especially if the SIM card slot is not inside the device, but side). Turn off the phone, remove the card, blow out the hole, and then leave the phone in a dry place for several hours.

If you dropped your phone into water, you must quickly turn it off and take it to a service center

It would be logical to blow out the slot not with lungs, but with a compressor designed for this purpose. The fact is that with air under low pressure you can only blow the dust deeper. If there is no compressor, it will be more effective to simply try to shake it out.

It’s worth warning right away that if your phone fell into the water, then it’s obvious why the SIM card stopped working. Contact the service center immediately, because untimely repairs can render the equipment unusable. A similar decision should be made if you simply dropped your phone or it was in the sand.

Locked device

Very often, in pursuit of cheap prices, we order mobile devices from abroad, from dubious online stores, or simply buy them third-hand. Or maybe we just don’t read the contract when buying a branded phone at a very low price.

A locked phone is tied to a specific operator and only works with its SIM cards, therefore, it simply won’t be possible to install another one. There are two ways to solve this problem: either find out who your phone is linked to and install a SIM card from that operator, or find a specialist who will perform the unlocking procedure for your device.

Reaction of a locked iPhone to someone else’s SIM card

It is worth considering that the tied provider does not always officially provide services in your country, for example, if you ordered a phone in America and it is tied to the AT&T operator (a favorite problem of lovers of cheap iPhones from EBay), you will need to either move to another hemisphere, or unlock again.

Diagnostic instructions

When the user does not know what to do if the phone does not see the SIM card, he will need instructions that allow him to perform the simplest diagnostics to detect the problem with his own hands:

1. Correcting the SIM card. Even a slight displacement in the connector caused by shaking or falling makes it impossible for the gadget to detect the card. This is especially true if a person himself cut it from a larger one, for example, tried to make a micro-Sim.
2. Inspect the plastic. If dirt is found on the contact side, remove it with a damp technical wipe, taking utmost care.
3. Pay attention to the slot. If the card holder becomes loose, the contact between the smartphone and the card disappears. You can place a piece of paper or slightly bend its part to increase the volume and create a more stable contact.

If the above methods did not help, you should put another SIM card in the slot: if the problem is in the phone, it will not be recognized either. Owners of dual-SIM smartphones just need to install the plastic in another connector and check whether the network will be detected.

Use esim

A recent technology, eSIM, is a virtual SIM card that operates using a small chip embedded inside the smartphone. In many countries, users can choose mobile operators and communication tariffs directly in the settings of their device, without visiting communication stores. This eliminates problems associated with physical damage to the card.

eSIM appeared in Xiaomi smartphones with the MIUI 10 update. The developers added a special application that uses “dollar traffic”, which is based on virtual eSIM technology. When the application is running, the smartphone is assigned a virtual number.

At the beginning of 2020, Xiaomi devices support eSIM only in China. Among other things, this function does not work if the phone has two SIM cards.

https://www.youtube.com/watch?v=W01YeCrOuo0

If we talk about Russia, at the moment only Tele2 has offered its subscribers to use such a service. To do this, clients should contact one of the five Moscow communication stores with a request to switch to an electronic SIM card while maintaining their number.

Once the application is approved, their plastic card will no longer work. If a user wants to switch to a virtual SIM card, but he is not a Tele2 client, then he must first purchase a regular card.

The remaining major operators — MTS, Megafon and Beeline — did not approve the introduction of eSIM. In their opinion, this technology will lead to increased competition (including with smartphone manufacturers) and a reduction in the revenue of the operators themselves.

How to restore incorrect imei after flashing android

To restore IMEI yourself, you need to be sure that the actions performed are correct. If any of the instructions did not help, contact the service center.

Before correcting an incorrect IMEI, you need to make sure that the settings are incorrect — compare the combinations on the device and documents. If the problem appeared after the firmware, you need to perform manual configuration:

1. Remove the SIM card (if there are two, both).
2. Find on the Internet the code to enter “engineering mode” for your phone model. For example, for Lenovo A319 the code looks like “*#*#3646633#*#*”.
3. Wait for a while, do not perform any commands on the phone.
4. A menu will open in which you need to select the “connections” item.
5. Select «CDS details».
6. A menu will open in English, where you need to select the “radio information” item.
7. Select Phone1 if there is only one SIM card in the phone.
8. A window will open in which you must enter the letter E.
9. You must enter the correct IMEI code between the quotes.
10. Select «send at command», then an error message may appear.
11. In case of error, add a space after on the same line where the IMEI was entered.
12. Reboot your phone.

The example smartphone has two SIM cards. After setting the settings on Phone1 (6th point), you need to repeat the operations for Phone2 and only then reboot the phone. The considered method is similar for all Android devices.

Card damaged

A common reason when a SIM card does not work is mechanical damage. Even if the contacts are saved, but the plastic carrier is broken, the edge is chipped, or the shape of the card is damaged, the gadget may not recognize the SIM card due to its incorrect location in the device slot.

The solution to the problem is to replace the SIM and get a duplicate while maintaining the number and balance. The Tele2 operator will replace the card if the owner personally contacts the subscriber service point. The procedure requires identity verification, so take your passport with you. To receive a duplicate you need to pay 50 rubles, the entire amount will be credited to your account after activation. The cost of the service may vary depending on the region.

SIM card does not work after flashing

A common cause of SIM card failure is flashing the device. Failures during installation or incompatibility of custom firmware with your device can cause a similar error. The best solution in this situation would be to return to a backup copy, which is usually done before manipulating the operating system.

If backup is not your style, then copy the necessary files to the media and return the device to factory settings or simply install the official firmware from the website of your phone manufacturer.

ROOT and Jailbreak allow you to gain full access to the file system, but are punishable by sanctions from manufacturers, including complete refusal to repair

If you have ROOT or Jailbreak, remember if you installed dubious modifications for your device or deleted unfamiliar files? Even such simple tweaks as replacing the dial tone or changing the voice can lead to dire consequences. It is very likely that you simply damaged the system drivers, which caused the mobile connection to fail.

Invalid imei

After checking the IMEI, you realized that it is worn out or does not match. How to recover? Open the service menu using the code (for all operating systems):

MTK processor

*#*#54298*#*#

*#*#3646633*#*#

dial the combination as a number and press the “call” key;

go to “CDS Information – Radio Information – Phone1”;

at the top under the AT item, enter in the field EGMR=1.7 “enter the correct IMEI” – for the first SIM card or EGMR=1.10 “enter the correct IMEI” – for the second;

2. press the “SEND AT COMMAND” button and the new settings will take effect;

   reboot your smartphone.

   You can fix it using the “Chamelephon” application if you have ROOT rights. You can always contact the service center to resolve the issue.

   Incorrect settings

   Why doesn’t the phone see the SIM card?

   1. Check to see if you have Airplane Mode or Autonomous Mode enabled. When airplane mode is turned on, mobile communication services will automatically turn off.

   • click the setting icon;
   • select additional settings;
   • turn off “airplane mode”.

   Didn’t help? Pull out the SIM card, wait about half a minute and reinsert it. Reboot your phone/tablet.

https://www.youtube.com/watch?v=ornE-MacOi4

2. Check whether the SIM card is enabled in the phone settings, relevant for devices with two or more SIM cards on Android:

• go to settings options;
• select “SIM Card Manager”;
• activate the desired SIM card by clicking on it or switch the slider next to it to “On” mode.

If it doesn’t help, try sending a message from an inactive SIM card and the system will automatically ask you to turn on the card.

3. The phone does not see the new SIM card — activation failed. What to do:

• install a SIM card, turn on the device;
• enter the PIN code (indicated on the plastic blister where the SIM card was secured upon purchase);
• make a call to the toll-free activation number.

4. No registration on the network. You will need to manually search for the nearest station through the settings:

• go to settings;
• click “Advanced settings”;
• click «Mobile networks».

The device will start searching for all available operators and display a list of possible connections. Select what you need and activate it.

If none of the methods work, do a full reset: “settings” – “backup and reset” – “data reset”. Pre-archive your data for automatic recovery.

Wrong size

Illustration of common SIM card sizes

No matter how strange it may sound, the reason for the lack of communication may be incorrect installation of the card. Now there are three sizes: SIM, Micro SIM, Nano SIM. Accordingly, if you insert a SIM card of the third type into the slot for cards of the first type, the contacts will not match and the phone will not see it.

Checking compatibility is very simple: the card must fit perfectly into the hole. If the installed card is easy to move in its tray, you need to order an adapter for a larger size or contact the operator to obtain one.

Speaking of the same sizes, sometimes the following problem arises: operators issue standard size SIM cards, but make cuts for Micro and Nano SIM. If the contacts in the SIM card tray are under a lot of tension, they may push the smaller size out of the slot over time.

Unsuccessful conversion to microsim

In the communication store, a special stapler with the exact size of the new shape is used to cut SIM cards. The risk is minimal, but still exists when old-format SIM cards with a wide contact field are used for cropping. Trimming yourself with scissors can also cause damage. As a result, the smartphone does not see the SIM card.

There is only one way out — getting a duplicate. You can prevent the situation if, when purchasing a SIM card, you immediately select the correct size depending on the phone model, and to change from a micro- or nano-SIM card to a mini-SIM card, purchase plastic adapters.

Contact oxidation

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 can occur for many reasons:

• Flooding or getting wet (even use in the bathroom or in the rain, in a humid environment);

Excessive heating, device overheating;

• 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.

https://www.youtube.com/watch?v=Ngk4riZ_7A4