What is the problem that the phone can t read the memory card? Please tell me

1. The memory card is broken (try to replace a mobile phone) 2. The mobile phone card slot is broken (try to change a few more memory cards) 3. Memory card write protection, some memory cards can only be used in specific places with specific functions in straight line, such as special navigation cards can only be used for navigation 4, the mobile phone is poisoned, or the smartphone driver is deleted, you need to drive 5, the card is reversed 6, your card is deleted by you, there is no allocated space].

Software problems, then it's hard to say, you can only go to re-flash, and if the hardware is not good, you can only repair it. If it's not a problem with the software or the phone. You can refer to:

Some SD card workmanship problems, there are poor contact, etc., you can try a little paper on the back of the card. Or plug and unplug the card and restart it. ]

Wipe the memory card with the card holder first.,Pick up the card socket contact a little.,Or it doesn't work, it may be that there is a problem with the memory card holder or the CPU of the machine.,Take it to repair.。。。

Change your friend's memory card to test it, and then put your memory card on your friend's phone to test it to know if it's the card or the phone].

Hello: Format the memory].

1. If the mobile phone is turned on, if the memory card is not taken out in the correct way, the data in the card may be damaged, and the damaged data cannot be retrieved. The correct way to retrieve the card: Turn off the mobile phone and remove the memory card, or go to Settings - Storage & Storage - Unmount the SD card, and then remove the memory card.

2. Turn off the phone and take out the memory card, observe whether there are stains on the metal surface, clean it and reinstall the memory card to see if the data is recovered.

3. Use the card reader to install the memory card and connect it to the computer, or install the memory card into other devices to check whether the data is normal. If you can't open the data files, it may be data corruption or memory card corruption, it is recommended that you try to format the SD card after backing up the data in the card, or replace it with a new memory card.

How to format the SD card: Go to Settings - RAM & Storage - Format the SD card, formatting the SD card will erase the data in the card.

4. If the memory card capacity is full, the new files stored may be abnormal, so it is recommended that you migrate data regularly and free up space.

5. If the above methods fail to solve the problem, please back up your mobile phone data in advance, and bring your mobile phone and purchase voucher to vivo customer service center for testing. Customer service center address: Enter the vivo official website vivo**app--my-service outlets or vivo official website web version--bottom of the bottom--service support--service network inquiry--select the province and city to query the customer service center address.

It is recommended to contact ** in advance before going to avoid empty running, plan the itinerary reasonably, and travel safely.

If you are using a Huawei phone and the phone does not recognize or read the NM microSD memory card, you can use the following methods to troubleshoot the memory:

1.Please confirm whether the device supports the installation of memory cards

You can check with your sales representative or Huawei** to see if your device supports the installation of memory cards, and the types of memory cards supported.

1) If your device does not support the installation of memory card, it will not be recognized.

2) If your device does not support NM memory cards and only supports MicroSD memory cards, please troubleshoot as follows:

You can check with your sales representative or Huawei** to see if your device supports the installation of memory cards, and the types of memory cards supported.

a.If your device doesn't support installing a memory card, it won't be recognized.

b.If your device does not support microSD memory cards and only supports NM memory cards, follow the steps below to continue troubleshooting.

Check whether the SD card is encrypted: If the SD card has been encrypted on the mobile phone, use the original mobile phone to decrypt it before using it.

Check if the SD card is damaged: Try to place the SD card in another phone to make sure that the SD card can be recognized correctly.

2.Please check whether the memory card is inserted into the corresponding nm card slot.

The device will recognize the NM card only when the NM memory card is inserted into the NM card slot. There will be nm card slots""nm""Identification lettering.

3.Please try inserting the SIM card in the NM card slot.

Try inserting the SIM card into the NM card slot to see if it is recognized. If the SIM card is not recognized, the card slot may be damaged, so we recommend that you back up important data (third-party apps such as QQ and WeChat need to be backed up separately) and bring the purchase voucher to the Huawei Customer Service Center for testing. If the SIM card is recognized, continue with the troubleshooting below.

4.Please confirm whether the NM memory card was purchased from a regular channel and whether it is Huawei**.

Third-party NM memory cards may have quality issues that cause the card slot to be unrecognized. For Kirin 990 series mobile phones, due to the addition of authenticity identification of NM memory cards, non-Huawei original NM memory cards cannot be recognized.

NM memory card authenticity identification method:

1) It can be confirmed by the product order or by checking whether there is a product serial number (composed of 13 digits, the first four digits are the production year and month) on the gold finger surface of the NM memory card.

5.Still can't solve it?

If there is no abnormality in the above, the nm memory card itself may be abnormal, and it is recommended that you back up important data (third-party applications such as QQ and WeChat need to be backed up separately), and then bring the NM microSD memory card, its packaging, and purchase voucher to the nearest Huawei customer service center for testing.

Make an appointment for service. Boarding service.

Repair spare parts** inquiry.