iphone 4 and 4s worked wonderfully well
We purchased 2 of these, one for my iPhone 4 and one for my wife's iPhone 4S. The sound quality is good and it's easy to use. Any complaints I have are related to the iPhone 4 ability to do hands free calling. With a touch of the ear piece I can speak the name of the person I want to call, and if my iPhone 4 can understand me the call is initiated. Just as easy to turn off at the end of a call.
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