Why can't GSM card be put on Sony Ericsson's mobile phone to send text messages?

Mobile phones can receive short messages, but they can't send them. If this is the case, please see the mobile phone information setting center.

Has the number been deleted? If the number of the mobile phone information setting center is deleted, call 10086 to inquire.

10086 know the number of the information center.

If that numb setting of the information set center has been set or has not been set

Yes, or your mobile phone may be infected with a virus. There is something wrong with the mobile phone software program. If there is something wrong with the mobile phone software program, your mobile phone should be upgraded.