Why can't I get a 11 message on my mobile phone?

There are the following reasons for not receiving the SMS: 1. You can check whether the mailbox is full first, and if so, please delete some information; 2. If you still can't receive it 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 problems do not exist, please contact Unicom customer service to handle this problem.