I received a lot of short messages, with a short message attached to it, which was sent by an APP user. Invalid reply.

Send text messages to everyone in an area.

A: Hello! This is the function of the mobile base station. Many people use backpack base stations to advertise or send fraudulent messages, which is illegal.

When I sent messages to everyone, it showed that some messages failed to be sent, but they didn't. ...

A: If the mobile phone can't send short messages, Samsung mobile phones generally suggest the following steps for troubleshooting and handling: check whether you can answer the phone. If not, please check whether the machine signal is stable and whether the phone bill is sufficient. If the phone calls normally, but can't send short messages, suggestions: 1. Check whether the number of the information center is correct.