I have a Samsung Galaxy S5. I changed to straight tale and use the AT&T network. Why can't I send SMS?

[AC Question]

I have a samsung galaxy s5. I changed to straight tale and use the AT&T network.

I can not send MMS messages.We tried many different codes and spent a lot of time on the phone with straight talk.

 

[Rukbat]

Re: I have a samsung galaxy s5. I changed to straight tale and use the AT&T network.

You got a Straight Talk SIM card - there's a set of APN settings that came with the card. Those are the ones that should work.

If they don't, go to ST's Facebook page for help. (Some of their best tech support people are there.)