Didn't a developer discover device ID's in an OS beta version - iPhone 3,1 iPhone 3,2 iPhone 3,3?
I am fairly certain I remember reading that. Those could refer to 1) AT&T 2) VZ and Sprint 3) T-Mobile.
Just a total wild ass guess. I am sure eventually iPhone will be coming to all carriers, but the timing is totally up in the air.
I would think T-Mobile might be the first, since its GSM, and the only modification would be the radio that had that odd T-Mobile 3G frequency band. In addition, Apple already has a relationship with Deutche Telecom, the parent of T-Mobile.
The Sprint and VZ should be able to work on the same CDMA model.
I don't see why the iPhone wouldn't go to Sprint and T-Mobile too, if it lands at Verizon.
In other iPhone markets, when exclusivity ended multiple carriers picked up the iPhone. ex.- France, UK, Canada. Thus, it would make sense that Verizon wouldn't be the only carrier to receive the iPhone.
However, Sprint and T-Mobile have smaller customer bases. In addition, both have a greater proportion of pre-paid subs as opposed to Verizon which has 90% postpaid subs. Thus, the iPhone would have less appeal at T-Mobile and S relatively speaking. But, that doesn't eliminate the two as possibilities, just would make it seem that those two are less of a priority than Verizon.