1, try to restart the phone.

Please restart your mobile phone and turn on the WLAN again to see if it can be used again.

2. Upgrade the system version

Please upgrade your mobile phone to the latest version for viewing.

3. Reset the network settings

Go to Settings-System Management-Backup and Reset-Reset Network Settings-Reset Settings, and then use View.

* Note: Resetting the network settings will reset the WLAN, mobile data network and Bluetooth connection records.

4. Restore all settings

Go to Settings-System Management-Backup and Reset-Restore all settings, and then follow the onscreen instructions.

* Note: Restoring all settings will not delete any data or media files, but only restore all settings of the mobile phone, and some third-party application accounts need to log in again. Please ensure that the use of the software will not be affected before operation.

5, service center testing

If the above methods fail to solve your problem, please back up your mobile phone data in advance and take your mobile phone and purchase certificate to vivo customer service center for testing. You can go to the service center with your mobile phone, ID card and valid purchase certificate, enter the browser to search for vivo official website-service-service center-view all-select provinces and cities to inquire about the address and contact information of local service centers.