SO....my dad gave me this iphone jailbroken able to use tmobile as a carrier. My sister accidently tried to restore it and now when I turn it on, it doesn't let me access the iphone without a sim card, and i can't use my tmobile sim card. (there's a picture of a usb cable connecting to the itunes logo) How would I jailbreak my phone so it could access tmobile again, so I can use my iphone?