What is the problem that the SMS of Android telecom card can't be sent out and shows that it is being sent?

Hello! Generally, these situations are 1. It is the mobile phone arrears (of course, it is estimated that LZ will not make this mistake). 2. In other words, the center number of the short message may be changed or deleted unintentionally. 3. Either there is something wrong with the system or the phone has been brushed!

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