It would depend if the iPhone had been unlocked by Sprint if it is then you would need to migrate over to Verizon service for which you would need a MAC code.
No, Sprint does not carry iPhone 4. Only Verizon and AT&T.
No. In the US, the iPhone is exclusive to only AT&T and Verizon.
AT&T, Verizon, and Sprint.
Verizon, Sprint, and AT&T
At&t, sprint, and verizon but i would reccomend verizon because at&t and sprint have the worst service
No. The iPhone 3GS is sadly a GSM only phone, so it cannot function on Sprint (or Verizon's) bandwidths.
yes if you have a iPhone with at&t . the way to switch iPhone carriers is take the iPhone sim card out and put a t moilble sim card or Verizon or sprint or boost moilble or whatever phone company
Sorry, OnStar can be activated with a Verizon phone. The OnStar phone can be added to a family plan as a family phone.
Yes, but keep in mind that unlocking your iPhone is illegal and can get you in a lot of trouble.
Virgin mobile Verizon AT&T and Sprint have the I Phone available for people
As of right now ONLY AT&T carries the iPhone, they are on Edge coverage. BUT as you have probably heard, Verizon will be releasing the iPhone4 this February 2011. They are on a cdma network, as well as Sprint. It IS a possibility that Sprint could want in on the iPhone obsession, but lately Sprint has been looking into more Windows based phones. So it's unlikely that iPhone will be released by them, at least not anytime in the near future. It may be possible to jailbreak one to Sprint after the Verizon release but that's the only real possibility.
Yes, there is. It is currently called, the Iphone 4S. Note that this is NOT a 4G phone. In the U.S, it is currently on the Sprint, Verizon and AT&T network.