Why can't Unicom send short messages?

Cause and solution: \x0d\ 1. SMS service is not enabled on the mobile phone. You can call 100 10 to contact customer service or go to the local business hall to activate this function. \x0d\2。 The set address book number is wrong, just reset it. \x0d\3。 The signal is weak, there is no signal or the battery of the mobile phone is insufficient, which leads to the abnormal transmission of information. \x0d\4。 Because the system is busy, especially during the peak period of sending short messages on holidays, it is recommended to try again later or avoid the peak period.