I just got an iphone 3g from a friend. i did the restore on it and now there is a screen with a itunes logo and a usb cord. it says insert sim to activate. i don't have a sim card from att, im on tmobile and want to be able to unlock and jailbreak but without a sim card from att is there any possible way? i am also getting a new power button with the ribbon cause the power button doesn't work anymore. can someone help me with this please?