Why did you receive the text message and repeat it twice? Do you have a backup?

1, network delay. That is, when a message was sent in the past, it was forwarded to the other party's mobile phone through the network server used by the other party, but the other party did not receive it because of the signal or other problems, so the server would repeatedly send it after a certain period of time until the other party received it.

2, mobile phone failure, that is, after you actually click send, your signal is not actually connected to the other server. So your network will automatically default to sending failure, so it will repeat sending again. Until the other server receives it, and at this time, it is very willing to generate fees.