If you have a Mac code to transfer to that different network, then yes.
No, Sprint does not carry iPhone 4. Only Verizon and AT&T.
Right now, you can get a cheap iPhone 4 from Sprint and AT&T. You can get one from AT&T for around $100.
At&t, sprint, and verizon but i would reccomend verizon because at&t and sprint have the worst service
No. In the US, the iPhone is exclusive to only AT&T and Verizon.
No. The networks used by Sprint and AT&T are incompatible.
No. Currently the IPhone is only available through AT&T with a contract.
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.
No. Different technology. ATT is GSM and takes a sim card. Sprint is CDMA and uses internal programming. Completely incompatible.
The iPhone 4, is officially supported ,and sold by Verizon, Sprint, and At&t. Same goes for the iPhone 4S. The At&t version can be unlocked, and can be used on a compatible network. Also, the iPhone 4S is coming to Virgin Mobile, and Cricket Wireless
AT&T, Verizon, and Sprint.
Verizon, Sprint, and AT&T
The AT&T version of both the iPhone 3GS and iPhone 4 are built on what's called GSM radio technology (used by both AT&T and T-Mobile in the US). Meanwhile, Verizon and Sprint use a completely different technology called CDMA. The two standards are incompatible. They use different radios and operate on different wireless frequencies. So, no, you cannot take your existing AT&T iPhone and walk into a Verizon store and simply switch networks. Even if you own an iPhone 4 you will have to purchase a completely new iPhone 4 with CDMA chips in order for it to work on Verizon.