Suddenly I didn't receive the text message and did nothing.

Hello, 1. According to the information you provided, if you can't receive SMS, there may be the following reasons:

1 Your number is currently in an abnormal opening state, such as loss reporting due to downtime. I suggest you open this number and try again.

2 Your mobile phone has put the short message into the trash can, or the mobile phone security software has intercepted the short message, you can look in the short message trash can first or the software has intercepted it;

Hardware factors cause your mobile phone to receive short messages abnormally, so it is recommended that you change your mobile phone for testing.

2. If the above reasons can't solve the problem, I suggest you contact Unicom's manual customer service to verify the handling. The actual situation is subject to local policies.