Moto X At&T Straight Talk Help

[AC Question]

Hello everyone, I currently bought an unlocked Moto X AT&T phone and I've bought a Straight Talk sim card. I am able to text just fine but my problem is that I can make any calls. I've called Straight Talk several times already and yet till I'm not able to call or receive them. Please can anyone help me fix this problem.

 

[Golfdriver97]

In Settings>wireless and networks, you should have an option More... at the bottom. Click that, and that should get you to a list of options including Access Point Names. See if changing one of those might help.