Unicom's mobile phone suddenly can't send and receive short messages, so use another mobile phone. Why?

1. Unable to receive SMS or verification code for the following reasons: 1. You can check whether the mailbox is full first. If it is full, 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 it can be received in other places to see if it is the reason for the weak local signal. 2. If your mobile phone can't send short messages, you can try to restart or replace the test for the following reasons: 1. The SMS center number is set incorrectly, please re-enter the correct SMS center number; 2. No signal or low battery; 3. Because the system is busy during the holiday short message sending peak period, it is suggested that you try again later or avoid the sending peak period; 4. The sending format is incorrect. If you send a short message to PHS users, you need to add the area code before the number; 5. The short message sending time exceeds 24 hours; 6. The mobile phone shields the short message sending function; 7. Blacklisted by SMS; 8. Insufficient quantity balance; 9. SMS inbox and outbox are full. If the above reasons cannot be solved, you can contact the local manual customer service or go to the business hall to confirm whether the SMS function is enabled and hand it over to the staff.