hi everyone
anybody know how to reset the iphone to the factory setting? i try to unlock my phone firmware 1.1.2 with the next sim, i couldn't get it to work. i got so frustrated that i go into setting-general-reset i reset most of the stuff i download into the phone. now i couldn't get any screen when i press in Installer. everything else work, except the service. i'm using T-Mobile, before i reset, when i put my t-mobile sim and next sim in the phone, it show a t-mobile service but i can't make outgoing call or recieve. what should i do now? please help if anybody know how to solve this issue.....thanks

Didcha try iclarified.com 's tutorials?

not sure that this will help but restore, do the jailbreak stuff from iclarified and install iworld too