How to check the number if there is no signal in the mobile phone card?

If you use a vivo phone, it is recommended to refer to the following troubleshooting methods:

1. Insert and unplug the SIM card again, or replace another SIM card. Cutting the card may cause the SIM card to be damaged beyond recognition;

2. Try to turn on the mobile phone flight mode and then turn it off, or change the network environment;

3. If two telecom cards are used at the same time, the secondary card (non-data card) must open the VoLTE service and open the mobile phone VoLTE HD call. At the same time, the operator network needs to support 4G VoLTE service to use dual telecom cards, otherwise one telecom card has no signal;

4. Go to mobile phone settings-mobile network/dual card and mobile network to check whether the SIM card is turned off;

5. Restore all settings: enter Settings-System Management-Backup and Reset-Restore all settings;

6. Take the mobile phone to the customer service center for processing. Address of customer service center: Go to vivo official website/Browser-My/Search vivo official website-Service outlets-Select provinces and cities to inquire the address of customer service center.