This Bluetooth Headset is described explitzit as "Apple iPhone 4S". But watch out - at least on my iPhone 4S - not. The headset is not detected in spite of various attempts. And at the price of EUR 9.90 to me the effort of resending is almost too big. Very annoying! Maybe I just caught a "Monday device". Other Bluetooth headset, for example. Plantronics PLT M55 / M25, namely cost 20 EUR or 30 EUR more, but are recognized by the iPhone immediately and can be linked easily, incl. Good sound quality.