Letv 1S I can send text messages now, but I can't send text messages and there is no solution.

If the mobile phone shows that it has been delivered but the other party's mobile phone has not received it, one possibility is that the other party's mobile phone is in arrears, the other possibility is that the other party's mobile phone has problems, among which there may be problems with the short message function of the mobile phone, and the other possibility is that there is a problem with the use of short messages on the sim card, and you need to manually dial 10086 or10 to solve the problem. I hope I can help you and adopt ω.