Hello, i am having a problem my torch can't detect any 3G network, only 2G (GPRS,EDGE) and when i choose to connect to 3G only, it says no networks available, i have changed the sim seem the problem was not in the sim, its on the phone i tried 5 sim cards, i made a security wiipe and the problem still presist, i updated my OS, and no use, then i reinstalled the software and deleted the old one, and i still have the same problem, i dont know if its in the antenna, i went to the retail store i bought it from, they closed the shop, i went to many blackberry maintenance centres, they dont know what the problem is.
please if any one have an idea let me know on how to solve it.

thanks in advance