5230 can't send text messages in different places, but it's ok here, but you can send text messages by putting your card on someone else's mobile phone. Please ask the master to explain.

If you can send messages locally, prove that the message number in your information settings should be correct.

Others said that there are two plans to be confirmed.

First, call customer service 10086 to confirm whether there is any problem with this SIM. If there are no mistakes.

Second, I heard that there is a kind of network sub-lock in the mobile phone. Sometimes the phone is locked wrong and you can't send text messages in other places. At this time, it is necessary to restore the mobile phone to the factory settings. Or take it to the mobile phone shop to change the system.