Like if the iPhone was unlocked and you used T-Mobile as your provider. Will it work just as good? What if I do the cheapest plan will everything work, like the internet?

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iFrogz Luxe Case for iPhone 3G, 3G S (Blue/Black)This hard shell plastic case is unbelievably sleek and finished with a stunning metallic facade and a velvety "soft touch" feel.Each case slides perfectly around your iPhone, allowing access to all of the buttons, ports, and sensors.