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Dual sim card for i phone 4g For TheiPhone 4can do plenty, even play nicely on other GSM networks when you’veunlocked it with ultrasn0w, but up until now you couldn’t put two SIM cards inside it. I-smartsim’s newiPhone 4 Dual SIM Adapter Casedoesn’t quite change that – the two SIMs in question aren’t exactly within the iPhone – but it does allow you to easily flip between cards without reaching for theLiquidmetal tool. That’s because each SIM clips into a special adapter that then snakes round the side of the iPhone 4 and into the regular SIM tray. A transparent plastic shell keeps everything safely in place, and there’s no need to cut the cards beforehand