So my brother upgrade from AT&T to Verizon and said I could just have his iPhone 4! Very nice... I have no plans to join AT&T just yet (have a year left on my Sprint contract, I am not so quick to just pay the ETF like he is), but until then I want to use the iPhone 4 like a glorified iPod Touch. Besides the obvious like Texts, Phone Service, etc... what features can I expect to not work on the iPhone 4 without a cell plan activated on it? I'm mainly curious about the GPS. Can I use the compass with Geocaching applications? Will it add GPS data to the photos that I take? Can I still make Facetime calls? I use an iPod Touch 3G already. I assume I can just plug this thing in an restore using one of my iPod Device backups and everything will magically work, right? When I lost my iPod Touch 2G I was incredibly surprised how simple it was to get back up and running with a new device, no neededing to install everything again or anything like that!