Why is my boyfriend's phone number empty? This has never happened.

It is possible that the other party has blacked you out.

Exclusion method:

First of all, it is recommended that you replace a known-good SIM card to test and eliminate card problems.

Switch to the position with good signal.

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.

The other party used the communication assistant software, set some numbers to make calls, or the strange numbers did not exist. It can also be set to "stopped", "temporarily unable to connect", "out of service" and other prompts.

If the other party uses a smart phone, the number can be set to blacklist, and the response can be set to "The number you dialed does not exist".

Or the call from this number has been transferred to another number, and the other number does not exist. So this happened.

If it doesn't work, back up the phone data (contacts, text messages, photos, etc. ) and restore the factory settings.

If the problem still exists, I suggest you take the three-guarantee certificate of your mobile phone and go to the nearest service center for inspection and maintenance.