The data connection of the mobile phone is always disconnected. What is the reason?

Suggested treatment method:

1. Switch the phone again and plug in the MIS card again.

2. If conditions permit, replace other SIM cards for testing.

3. Open Settings-More Networks-Mobile Networks-Access Point Name-Menu Key-Reset to Default Settings.

4. Check whether it has improved after updating the version of the mobile phone system.

5. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings.

6. If the fault still exists, it is recommended to send the mobile phone to the nearest after-sales center for testing and maintenance.