Works fine with my iPhone 4 IOS 5.1.1 with no problem with voice and sms. Voice is exceptional loud and clear. Casing fits very nicely onto the Iphone. Can only charged the Iphone battery for only 10%. Manual is in chinese but you can find the manual in english if you google the net. It is easy to use. This dual sim casing will only works on jailbreak ... Read more
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