Why are the Weihai epidemic prevention numbers always busy?

The other party is on a call. Make a call when the other party is on a call.

The other party’s mobile phone is turned off (turned off when there is no signal). If the other party’s mobile phone is turned off, you will also be prompted that the other party is busy when you make a call.

The SIM card also manages a lot of information provided to the user's services and can be used to store short messages, especially those received when the user does not turn on the phone or is away.