What happens when the Mi 3 doesn t read the card, what is the reason why the Mi 3 phone can t read t

Hello, the mobile phone does not recognize the mobile phone card, please give priority to check whether the SIM card is installed correctly, whether it is a standard card: please insert the correct standard card, like the main card slot of telecom standard models, generally only support telecom cards. Please insert the correct size card, as the incorrect size card may be inserted but not recognized.

Some models do not support hot swapping, please restart your phone after inserting the SIM card.

If you insert the card correctly, use a standard card, and restart the phone after inserting the card, and the SIM card is still not recognized, please try the following solutions:

If you mistakenly turn on airplane mode on your mobile phone and mistakenly think that the card is not recognized, please turn off airplane mode.

Please go to Settings >> Dual SIM Management to check if this SIM card is not enabled, and if so, please enable this SIM card.

Please try to insert this SIM card into another mobile phone to detect whether the SIM card is damaged; Please try inserting a SIM card that can be recognized by another mobile phone into this mobile phone to check if the mobile phone card slot is damaged.

If the SIM card has been used for a long time, and the chip is worn or oxidized severely, resulting in poor contact, it is recommended to go to the business hall to replace the standard card.

If none of the above methods fail, we recommend that you back up your data and upgrade to the latest system version.

If the problem still cannot be solved, it is recommended to back up the data and bring the purchase invoice to the branch for testing.

Hello. Here is to know the Xiaomi enterprise platform, your question was recommended in, what you said is not comprehensive, in order to better serve you, please describe in detail.

If your phone can't read the card or the SIM card can't be detected, there may be one of the following situations:

1. The contact between the metal contacts of the mobile phone card and the mobile phone is insufficient.

Second, the mobile phone card is damaged.

3. Whether the location is a signal blind area or suddenly no signal.

Fourth, you can try to put the card on other mobile phones to try, and judge whether it is a problem with the card or the mobile phone through the method of changing the card and changing the phone.

There are many reasons why you can't read the SIM card, first of all, it is recommended to restart the phone to try, if it is not successful, it is recommended to reload the SIM card, because it may be that the SIM card contact is not strict, if it is not successful, please flash into the latest development version of the stable version.

There are several ways to do this:

Check the SIM card for rust marks, if necessary, rub it with an eraser a few times, wipe off the dust with a paper towel, and then reinsert the phone.

Check if the phone is broken, you can insert the SIM card into another phone, if it can be recognized, it may be that the phone is broken, if it is not recognized, it may be that the SIM card is broken.

Check whether the SIM card slot is loose, because the card slot is loose and the phone can't recognize the SIM card, in this case, you can move the SIM card up a little.

Hello. Try it out three times.

It's best to open the backup software that comes with your phone to back it up before clearing it to facilitate recovery.

m 3 m 4 be sure to back up the important files in the SD card to the computer before the three clearing, and the three clear will clear the data on the SD card).

Sanqing is to format the phone, which can solve most of the system problems, software flashbacks and other abnormalities, and Sanqing is also used to update the system before the finch friend.

Clear the system data to ensure that the flashing can be carried out normally.

The method of entering the REC mode and clearing the three clears.

The first method, open the system update software on your phone, the menu key, and select Enter REC mode.

The second method, in the shutdown state (deduct the battery by yourself, m 3 m 4 long press the power button for ten seconds to force shutdown), press and hold the power button and the volume plus button together, and then light up the screen and let it go.

Then go to a page, Chinese Simplified.

english

3, the power button is the OK key, the up and down keys for the sound leakage are selected, there are three options on the page, press the power button to OK, select Chinese Simplified.

4. Select Clear Data.

5. Select Clear Cache, and when the clearing is complete, select Clear Data again.

6. Select Clear User Data, and after the clearing is complete, select Clear Data again.

7. Select Erase All Data, and when the clearing is complete, select Restart the phone.

8. Select Enter the system with Recent.

9. After the phone is turned on, find it, back it up, and turn it on, and restore all the data.

Hi! Xiaomi mobile phone shows no service, it is recommended that you check it according to the following methods:

Whether the SIM card is inserted correctly.

Whether the wrong SIM card is inserted, such as the standard version inserts the telecom SIM card, etc.

Go to Hardware Detection to see if the SIM card is working properly (enter * * on the dial screen). If the SIM status is normal, go to step 5, or if the status is unknown, go to step 4.

Try to replace a different SIM card, if the status is still unknown during hardware testing, it is recommended to go to the repair point for testing; If the detection status is normal, it is recommended to go to the carrier to replace a SIM card (the SIM card may be aging).

Whether the network type is correct and whether the carrier selects Automatic. (China Unicom selects 3G priority, mobile selects only 2G, and China Telecom selects automatic).

If the network type of the non-telecom mobile phone is CDMA automatic, you need to change the network type to "WCDMA Preferred" in the mobile phone information (**) to solve the problem.

Whether there is no signal in the area. You need to check whether other mobile phones on the same network have signals.

Back up your data, flash to the latest system version and try again.

If the above methods still do not help you solve the problem, please go to your nearest repair point for repair inspection.

How to deal with SIM card not recognized by mobile phone:

1. Please confirm whether the SIM card type is correct according to the mobile phone model. An incorrect SIM card can damage the card tray and card slot or even fail to be removed;

2. Please make sure to use a standard SIM card. Do not use a non-standard SIM card or cut the card by yourself, cutting the card can easily cause the SIM card to be unable to recognize or damage the mobile phone, it is recommended to go to the business hall to change the original standard SIM card;

3. Please confirm whether the card is placed correctly. Whether the notch of the SIM card corresponds to the card slot;

4. Please confirm whether the surface of the SIM card is dirty. If the SIM card has been used for a long time, you can wipe the surface of the chip with alcohol, or go to the business office to replace the original standard SIM card. If the SIM card is used for a long time, the metal surface is easy to be oxidized, which is easy to cause probabilistic card recognition;

5. Do not plug or unplug the SIM card when the device is turned on. After inserting the SIM card, please restart your phone and try;

6. If the problem still exists, please back up the data in advance and bring the purchase invoice to the after-sales service point for maintenance.

See if it's a SIM card issue or a phone issue.

1. The simplest reason is to check whether the SIM card is reversed, if it is reversed, the mobile phone will definitely not be able to read the SIM card, so you need to reinsert the SIM card in the correct way.

2. Change to a normal mobile phone, put the SIM card on another mobile phone that can be normal, and see if the SIM card can be recognized.

3. Go and get a SIM card that can be used normally in someone else's mobile phone, and put it on the mobile phone that can't recognize the SIM card, if the normal SIM card can't be recognized, then it means that some parts of the mobile phone are broken, it may be a hardware problem, or it may be a software problem.

4. Poor contact of the SIM card, for this problem, we can first press down the metal fixed shrapnel on the SIM card before loading the SIM, and after loading the SIM card, gently press it again, or move the SIM card back and forth.

5. For some SIM card slots that are not of good quality, if you often pull out the SIM card, it may make the SIM card slot bad, so that the SIM card can be identified on the normal mobile phone, and the other normal mobile phone SIM can not be recognized on our mobile phone, then the SIM slot may be really broken, and it can only be sent for repair, and then the reason is further determined.

6. When you encounter the situation that the SIM card of the mobile phone cannot be read, you don't need to be too nervous, you can check the situation of the SIM card of the mobile phone first, and see if the card is wrong, or because the SIM card is broken, of course, it may be because the mobile phone is broken.

Hi! Please ask which version of your phone is and which carrier's network you are using.

1. Please open the settings Mobile Network Network Type Selection Select Only 2G Network and try to see if it is normal.

2, if it doesn't work, remove the SIM card, reinstall it again, try to see if it's normal, 3, still doesn't work, it is recommended that you change the SIM card to try it.

Hi, at present, the Shimi 3TD version supports mobile 3G and mobile, China Unicom 2G network supports telecom networks.

If your phone can't read the card or can't detect the SIM card, you can try to put the card on another mobile phone to try it, and determine whether it is a card problem or a mobile phone problem by changing the card and the phone.

Hello. It is recommended that you try to install the SIM card into other mobile phones to see if it can be used, if you rule out the problem that it is not a SIM card, it is recommended that you can go to the nearest Xiaomi Home or Xiaomi after-sales service to let the engineer help you test it.

If it is within the "three guarantees" policy, it will be repaired to you free of charge.

The following is the query of Xiaomi Home and Xiaomi after-sales outlets. Mi Home address inquiry, Xiaomi authorized repairer outlet address inquiry.

How did you flash the phone, it may be a SIM card slot problem, or a system problem, it is recommended to go to the place where you bought the phone to see,

What model? If you have dual SIM and dual standby, put it in the second card slot and try it, and I tried it. It is also possible that the signal is bad, and it is necessary to ask for lz to adopt.

You can open your phone's settings first.

For mobile phones, check whether the baseband version, IMEI, and serial number are unknown, and if they are found to be unknown, it is recommended to send them for repair;

3.Go to "Settings--Network--Network Mode" and check whether the 2G 3G 4G setting mode matches the type of SIM card used;

4..Go to "Settings - Network - Network Operator", check Automatic, observe whether the service is restored, if there is no service recovery, restart to observe whether it is restored;

If you recover after restarting, it may be caused by "baseband and firmware", and you can flash the firmware and baseband maintenance again.

The first method is to turn on the airplane mode of the phone, wait for more than ten seconds and then turn it off to see if it can read the SIM card.

The second method is to turn off the phone and restart it, and see if the SIM card is valid after turning it on.

The third method is to take out the card with a card needle to see if the card is offset, and then adjust it and put it in to see how the effect is.

Fourth, if none of the above methods work, then back up your phone and restore the system.

If none of the above four methods work, then it is very likely that there is a problem with the hardware of the mobile phone, and you need to go to Xiaomi after-sales service to check and solve it.

See if there is any problem with the mobile phone card, or clean the card slot. If it doesn't work, you can only try a different card slot.