Why can't the mobile phone receive the message of 100 10?

There are several reasons for not receiving SMS: 1. You can check whether the mailbox is full first. If it is full, please delete some information. 2. If it is still not received after deletion, you can change the machine or card to see if it is a hardware factor; 3. After eliminating the above reasons, you can try to test whether it can be received in other places to see if it is the reason for the weak local signal. If the above problem does not exist, please contact Unicom customer service to handle this problem.