Originally Posted by laina609
I know how to update in iTunes, but I am not an AT&T customer, so if I just update in iTunes, my phone will not be able to use with T-mobile. I need a guide to tell me how to update, and also keep my phone unlocked and jailbroken or re-unlock to use with T-mobile. Thanks.
you must not be saying the magic words.
You can update with iTunes even if you are on tmobile. It will not lock you up. You will still be on tmobile and serveice will not be interrupted. The only cat h is that you won't be jailbroken.
I'm in 3.0 with tmobile on a 1st gen. I updated with iTunes from 2.1. I'm still up and running. Just not jailbroken.