Apple noted that the unlocked iPhone 4S will only work on GSM networks like AT&T. in the US and not on CDMA carriers like Verizon and Sprint.
It was reported earlier that Sprint is going to lock its SIM cards of every new iPhone 4S it activates, requiring by this users who travel to pay Sprint`s high roaming fees. Both AT&T and Verizon also lock their SIM cards although Verizon will reportedly allow customers to unlock their devices for international travel.
To buy an unlocked iPhone 4S right now, here is the link of Apple Store. Select you color you want. Scroll down to the “Or get iPhone unlocked and contract-free” link, click that, and choose your model. Your order summary will appear on the right. Click “continue”.
http://www.digitaltrends.com/mobile/unlocked-iphone-4s-now-on-sale-in-us-from-apple/
