When a friend calls his girlfriend, he is talking on the phone anyway, and so are other people's mobile phones. The mobile phone number is 6 120c. Please explain!

Haha, somebody else's home improvement software has improved.

Whether it's the call manager or something else, she blacklists your friend's number and all the numbers that are not in the phone book, so the busy signal is good, and you can also set the number you dialed to an empty number. Short messages can also be blocked, such as automatic deletion or manual deletion. If someone sets it to be deleted manually, you can send a text message to let her see it. Calling someone else's cell phone like this doesn't respond. So in other ways, he must have hurt her, so he made up his mind.