Hi, I have a iPhone 4 AT&T 32GB unlocked with gevey, anything works great. I bought this on eBay, was brand new and I don't have AT&T SIM card. When I plug in iTunes asking me to register, if I do what will happen? Will be locked? Will I need AT&T sim? If for any reason in future will need to restore, will iPhone locked, and impossible to unlock with gevey? iOS 4.3.5 baseband 04.10.01 Thank you.