I bought a t mobile sim for my galaxy nexus. The apn settings on straight talks website only work if I use the att apn settings. T mobile settings do not work. No data or picture messaging. I've tried as many different apns I can find and the only one that works is still the att one. Any thoughts or suggestions? Is there a way to tell if they actually sold me a tmobile sim? Would it matter what Sim you use, should either apn setting work?