The mobile phone number becomes empty, how to retrieve the backup in the colorful clouds?

Need to restore the mobile phone number.

The method for restoring the mobile phone number is as follows:

1. First of all, it is recommended to replace a known-good SIM card for testing to eliminate the card problem.

2. Change to a place with good signal.

3. Check whether the third-party software has been downloaded recently, whether there are any operations such as rejecting calls and starting blacklists, and try to uninstall it.

4. If it is invalid, back up the mobile phone data (contacts, text messages, photos, etc.). ) and restore the factory settings.

If the problem still exists, it is recommended to take the three-guarantee certificate of the mobile phone and send it to the nearest Samsung service center for testing and maintenance.