Sms notification

No, it's because the other party hung up or the other party didn't receive the signal.

Phone prompt tone when the screen is black:

1. When calling the other party, if the other party does not turn off the phone, it will prompt "Hello, the number you dialed is busy, please redial later".

2. If the other party turns off the phone, it will prompt "Hello, the phone you dialed is power off".

Solution of black screen of mobile phone;

1. If the other party blackmails you, you can choose to talk to him face to face.

You can dial with another mobile phone number.

3. If you just hacked your mobile phone number, you can choose to contact by Internet phone, such as QQ and WeChat.

Ask for help from people you all know, such as your family or friends, and ask them to pass it on.

5. If the phone is hacked, you can try to send a short message and you can receive it.