You can do that today... it's not the only way but I'd imagine it's pretty common: http://www.apple.com/shop/iphone/iphone-upgrade-program http://www.apple.com/

You can do that today... it's not the only way but I'd imagine it's pretty common: http://www.apple.com/shop/iphone/iphone-upgrade-program http://www.apple.com/shop/iphone/iphone-upgrade-program