Quote:
Originally Posted by GlennD
I chatted with an ATT rep about that as we're looking at upgrading our 3G phones to the 4. He said it will work as an iTouch, you just shut off the 3G network. You'll want to make sure that you keep your sim card - it won't function at all without it. Not an issue going from a 3G to a 4 as they're a different size card, but I don't know what's in your 3GS.
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Jailbreak with a sim unlock and it'll work just fine without a SIM. A 3G is imminently jailbreakable forever, and will likely not get many more (or any) updates in the future, so do it once and you're set.