Call the other party to remind them to turn it off. What's going on here?

There is no electricity and the signal is not good.

1, the other party's mobile phone is really turned off. Is it a dead battery or something else? Calling the other party again at this time will prompt the other party that the phone has been turned off.

2, the other party's mobile phone signal is not good, resulting in the phone can not receive the signal, can not receive the call, or the other party is not in the service area, then it may also prompt the other party's mobile phone has been turned off.

3. The other party has set the function of hanging up or prompting "power off" when the line is busy. At this time, after the other party hangs up your phone, it will also prompt the other party to turn it off.