Why did Unicom's mobile phone suddenly fail to receive short messages?

Unicom mobile phone can't receive SMS for several reasons:

1. Make sure that your phone is full of memory and can't receive new messages;

2. Check the settings of your mobile terminal to make sure that it has not been intercepted by third-party software such as mobile phone housekeeper and security guards;

3. Check whether the SMS receiving function is turned on;

4. If the verification code is not received and other point-to-point short messages are received normally, you can contact the short message center to check whether there is a sending record, or check whether the other SP sent the corresponding short message at the short message gateway;

5. The system is busy during the peak period of holiday short message service, and flow control is started. I suggest you try again later, or avoid the rush hour.

6. Signal difference leads to information delay.