What are the reasons for the poor signal of telecom cards and what are the solutions?

If you are currently using a vivo phone, the SIM signal instability/signal difference can be checked and handled as follows:

1. Please check whether metal protective shell, magnetic protective shell, magnetic bracket and other accessories are used. Metal and magnetic materials can easily interfere with signal reception. It is recommended that you remove the accessories for inspection.

2. If you are in a closed indoor environment (such as basement, elevator, etc.). ), the cell phone signal may be blocked, resulting in poor signal, so you can check it in the outdoor environment. If you are in a remote area, the signal may be poor. You can use the cell phone signal of the same carrier network around you to determine whether it is the cause of network coverage.

3. Observe whether there is dirt or oxidation on the metal surface of SIM card, and check it after cleaning. If a customized SIM card is used, it is recommended to replace it with a standard SIM card. Install the SIM card to other devices, or install other SIM cards to your mobile phone for comparative test to determine whether the SIM card is faulty. If it is because of the SIM card, I suggest you go to the operator's business hall to apply for a replacement card.

4. Go to Settings-System Management-Backup and Reset-Reset Network Settings-Select the corresponding SIM card-Reset Settings, and then use it to view.

* Note: Resetting the network settings will delete and disconnect the connection and pairing records of WLAN, mobile data network, Bluetooth and other networks. Before operation, it is recommended to back up data such as WiFi account number and password, and you can enter mobile cloud service-device cloud backup-backup data type-open system data.

5. If you can't see the "Reset Network Settings" menu, it is recommended to go to Settings-System Management-Backup and Reset-Restore all settings, and then follow the on-screen prompts.

* Note: Restoring all settings will not delete any data or media files, but will restore all settings of the phone. Some third-party application accounts need to log in again. Please ensure that the use of some third-party software will not be affected before operation. (Before this operation, it is recommended to back up the important data in the mobile phone to avoid loss and irretrievability. )

6. If the above methods can't solve your 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.

Address of service center: Go to the after-sales outlet of vivo official website /vivo Mall APP-My-or click /service/map.html and select your current city to get it.

Tips: It is recommended to bring relevant purchase vouchers (such as purchase invoices, warranty cards, ID cards, etc.). Before going, call the service center staff in advance to ensure that the staff can go again during normal working hours, avoid running empty, and pay attention to safety on the way back and forth.