Redmi Note3 mobile phone SIM is not recognized

1. Whether the SIM card is inserted correctly.

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

3. Enter the hardware detection to check whether the SIM card is working properly (enter * * in the dial interface). If the SIM status is normal, go to step 5, or if the status is unknown, go to step 4.

4. Try to replace a different SIM card, if the status is still unknown during hardware testing, it is recommended to go to the maintenance 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).

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

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

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

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

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.

It is recommended that you:

1. Enter "*" on the dialpad to check the IMEI number of the mobile phone to see if it is normal, if there is no IMEI number, you can go directly to the Xiaomi authorized service center for testing.

2. Reinstall the SIM card (pay attention to whether the SIM card chip and card tray are facing correctly, and there will be a corresponding SIM card placement method icon on the card tray), or if it is not recognized, remove the SIM card and wipe the metal chip area of the SIM card with an eraser or alcohol, and try again.

3. Enter * * on the dialing interface to enter the hardware detection, select "SIM card detection", and check whether the SIM card status is inserted.

a. If it shows that there is no SIM card or the SIM card is not inserted, try to replace the SIM card, and the SIM card is still not detected, you can restore the factory or flash the phone, and if it is still invalid, you can go to the Xiaomi authorized service center for testing.

b. If it can be detected after replacement and judged to be a SIM card failure, please go to the operator's business office to replace the SIM card and try it.

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 may damage the card reload 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, making and 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 is used for a long time, you can wipe the surface of the chip with alcohol, or go to the business hall 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.

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.

2. Problems with mobile phone signal. If you are in a remote area, you will not be able to find the signal, or try to find a place with a higher position.

3. The mobile phone card is not inserted properly, or it is not inserted correctly, take it out and put it back in.

Hello. 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.

If it still doesn't work.

Please go to a repair center near you to have it checked.

If the phone shows no SIM card after inserting the SIM card and turning it on, you can check it by following the steps:

1. Check whether the SIM card used is a mini SIM card or a nano SIM card using a tray. If you don't recognize this type of SIM card, it is recommended to try it with a standard micro SIM card.

2. Check whether the network standard of the inserted SIM card is appropriate.

3. Find the SIM card test in the hardware test, check whether the SIM card is working normally, if it is not normal, try to change to other standard micro SIM cards.

4. If it still doesn't work, you can go to the business hall to apply for a new card, if the new card can not be recognized, you can only find after-sales service.

Take out the SIM card and erase the brass sheet with an eraser.

After confirming that the mobile phone model and SIM card type are consistent, if you still don't know the card, you can check it according to the following methods:

1. Enter "*" on the dial pad to check the IMEI number of the mobile phone to see if it is normal, if there is a pre-indication that there is no IMEI number for smart rent, it is recommended to go directly to the Xiaomi authorized service center for testing and processing;

2. Reinstall the SIM card (pay attention to whether the card chip is facing correctly, and there will be a diagram of the corresponding SIM card placement method on the card tray; b.If the card tray is facing correctly), or if it is not recognized, remove the SIM card and wipe the metal chip area of the SIM card with an eraser or alcohol, and try again;

3. Enter * * on the interface of the short segment number, select "SIM Card Detection", and check whether the SIM card status is inserted;

a. If it shows that there is no SIM card or the SIM card is not inserted, and the SIM card is still not detected, it is recommended to restore the factory or flash the phone, and if it is still invalid, it is recommended to go to the Xiaomi authorized service center for testing and processing;

b. If it can be detected after replacement and judged to be a SIM card failure, please go to the operator's business office to replace the SIM card and try it.

If none of the above methods can solve the problem, it is recommended to go to a Xiaomi authorized service center for testing and processing.

Workaround:

1. If the SD card is not inserted or the contact is poor, you can reinsert the SD card to try.

2. It may also be caused by system problems, you can restart the phone to try, and if necessary, you can restore the factory settings to solve it; If you don't want to do a factory reset, you can fix it by upgrading your system.

3. If the SD card is faulty and cannot be used, you can change the SD card to test it.

4. Caused by hardware problems of mobile phones, such as card slot failures, internal circuit failures, motherboard chips and other component failures, etc., need to contact Xiaomi's after-sales service for maintenance to solve.