The text message sent by the mobile phone is always being sent, but there is no sending success or failure.

If your mobile phone cannot send text messages, you can try to restart or change the mobile phone for testing, and check whether the following conditions exist: 1. The SMS center number is set incorrectly; 2. There is no signal or the mobile phone battery is low; 3. The system may be busy during the peak period of SMS sending volume. It is recommended that you try again later or avoid the peak period; 4. The sending format is incorrect. If sending text messages to PHS users, the area code needs to be added before the number; 5. The SMS sending time exceeds 24 hours; 6. The SMS inbox and sending box are full. 7. To inquire whether the SMS function is activated, you can contact the local manual customer service. If the above reasons still cannot be solved, you can contact China Unicom manual customer service or go to the Unicom business hall to confirm whether the SMS function is activated and leave it to the staff for processing.