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I can't turn off message blocking? Using an unlocked AT&T with 1 line


    So originally, I have an Asus Zenphone, bought a Tmobile sim card and everything works well. However, when I got a Samsung Galaxy S6 that was unlocked from AT&T, I can't send any text message, there's the message blocking every time I tried to send SMS. I can make receive SMS and phone call, as well as data, so I don't understand.


    The thing is that I have only 1 account on my line, so I can't access the blocking message from the plan->choose line like all the tutorial I have read, so I'm extremely confused right now, if anyone can help, I appreciate a lot.

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