I got the 4S today (love it). I want to give my 3GS to my son. We're both on ATT, but he doesn't have a data plan. He currently has an unlocked 3G w/ the fake APN thing. He knows not to text msg. It has worked fine for the past 2 yrs w/o any added fees etc. The 3GS has 4.2.1. I saw you can deactivate cellular data now 4.0 and above which is cool. My question is can I restore the 3GS to iOS 5.0, not jailbreak and unlock it, and turn off the data via General>Network>Turn off Cellular Data and be good to go for him? Thx!