I am calling Shanghai. Why do you say 10 to remind each other in a few seconds?

This is the SMS reminder service launched by the operator (3 yuan/month);

If the phone is turned off, there is no signal, the line is busy, etc. , callers will hear this prompt;

If the other party hangs up, there will be a prompt when moving: first, hear the sound of connection, and then explain: sorry, the number you dialed is busy!