Hammer, the SMS is ringing, but I can't see anything.

There are three possibilities when the message rings, but no message is received: it may be that other mobile phone software has received the message, and the prompt tone is the same as the SMS prompt tone. Just check the open software. Maybe the message was intercepted by security software and treated as spam. Check the housekeeper software. It is possible that the information is full. By default, mobile phone information is saved by ringing, but the information has not been received yet. There are three possibilities: it may be that other mobile phone software has received the information, and the prompt tone is the same as the SMS prompt tone. Just check the open software. Maybe the message was intercepted by security software and treated as spam. Check the housekeeper software. It is possible that the information is full, and the mobile phone information is saved by default.