T310 no signal, please help!

[canny]

Hello All,

I have a problem, my t300 worked fine on tmobile for a couple of days but then just lost all of its signal, and has been unable to find the network since. i have now unlocked it and upgraded it to a T310 but i still have the same problem no matter which network sim i use. all i get from the phone is 'no network'

i have div 6.2, is there a gdfs file which can solve this problem?

thanks