Why do I send text messages on my mobile phone to show that the information is not sent?

According to the situation you described, the possible reasons and solutions: 1, the number setting problem of mobile phone short message center, it is recommended to check whether it is set correctly; 2. There is no signal or the battery of the mobile phone is insufficient; 3. The system is busy during the peak period of holiday SMS sending. It is recommended that you try again later or avoid the peak sending time. 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 SMS inbox and sending box are full; 6. Query whether Unicom card has SMS function. If the above situation has not been solved, it is suggested that you can contact the local manual customer service for handling.