I don't know what is wrong with my Xiaomi 3. Send a text message to Unicom, or a friend. It can't be sent out at all. Cary still has money, no problem.

If your mobile phone can't send short messages, you can try to restart or change your mobile phone to test whether there are any of the following situations:

1. SMS center number is set incorrectly;

2. No signal or low battery;

3. The system is busy during the peak period of holiday SMS sending. We suggest you try again later or avoid the 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. SMS inbox and outbox are full.

7. If you want to check whether the SMS function is enabled, you can contact the manual customer service of the number.

Despite the above reasons, it can't be solved. It is suggested that you can contact the manual customer service of the number or go to the business hall to confirm whether the SMS function is enabled and hand it over to the staff for handling.