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I assume the iPhone 4 will be available on Sprint/Verizon/AT&T. Since the 3GS was exclusive to AT&T I can't imagine Apple upgrading it to be compatible with CDMA carriers. It'll probably remain on AT&T exclusively.
 
They would have to manufacture a new 3GS, so chances are the 4 is Verizon compatible and 4S is the only one that's Sprint compatible
 
They would have to manufacture a new 3GS, so chances are the 4 is Verizon compatible and 4S is the only one that's Sprint compatible

they might have the 4 for sprint too. Sprint and Verizon should be able to run off the same hardware, so it'd only be a software tweak to get the 4 to run on Sprint
 
Darn it. I made a new thread about this. Lots of traffic. It's very possible, but I think the 3GS will still be AT&T exclusive.
 
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