Hello ARC Users, I recently acquired an unlocked ARC LT15a and tried to set it up on AT&T. I can successfully make phone calls, send/receive text messages, and browse the web - unfortunately only on EDGE 2G. I took it to the AT&T store and the rep spent about 2 hours changing APN settings and what not, but in the end could not get 3G to work. As I understand it the LT15a should have no problem working on AT&Ts 3G network, but it's just not working. Any thoughts??