There is no signal after the alarm of Samsung 4g mobile phone data usage.

You can try the following methods:

1. Restart the machine.

2. On the standby screen, click Applications-Settings-More Networks-Mobile Networks-Network Mode-Select GSM Only.

3. Test whether this is the case in different geographical locations, and initially eliminate the problem of network signal coverage.

4. If conditions permit, replace the SIM card for testing.

5. Check whether the mobile phone is equipped with software such as security guards or incoming calls, uninstall it and try again.

6. (Backup data: phone book, SMS, multimedia, etc. ), I suggest you restore the factory settings.

After restoring the factory settings, it still cannot be solved. It is recommended to send the mobile phone to the nearest Samsung service center for testing and further processing. Please click:

/support/location/supportservicelocation . do？ Page = service. Location and place. cid = cn _ PPC _ support _ service _ repair net _ 120522

Welcome to Samsung service to make an appointment:

/reservation