Why can't Red Rice note send short messages with Unicom card?

Unicom's mobile phone can't send short messages. You can restart or change your mobile phone and test it to see if there are any of the following conditions: 1. The 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, please try again later or avoid the peak period of sending; 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 sending box are full; 10. If the SMS function is enabled, you can contact the local manual customer service for processing. 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.