Why can't Xiaomi 6x send text messages?

If your mobile phone can't send short messages, you can try to restart or change your mobile phone for testing to see if the following conditions exist: 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 mobile phone shields the short message sending function; 6. Blacklisted by SMS; 7. SMS inbox and sending box are full; 8. The SMS function of the mobile phone card is not enabled. If the above reasons cannot be solved, you can contact local manual customer service or query feedback.