Why can't the mobile phone suddenly receive the short message sent by Unicom number?

You can't receive SMS or verification code due to the following reasons:

1, you can check whether the mailbox is full first, and if it is, please delete some information;

2. If you still can't get it after deleting it, 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 you can receive it in other places to see if it is the reason for the weak local signal.

If the above problems do not exist, please contact the local manual customer service to handle this problem.