I'm using these with an iPhone 4, and I'm very happy with them. The controls on the headphones let me manage volume, skip/stop/play music and podcasts, voice dial, and manage other voice commands such as music selection. Pairing was completely painless, and I was listing to tunes within a couple minutes of opening up the headphones.Audio quality is good. Certainly not up to the standard of premium headphones, but it's clear and free of static. MP3s sound just fine, as do games and videos.The quality for phone calls is more than acceptable, despite the lack of any sort of boom on the mic. When I called people, they said I was clear and weren't getting any background noise. Nevertheless, these are first and foremost headphones, and not a replacement for a mobile headset -- it would be a bad idea to drive or bike with these on.I've been quite pleasantly surprised at how much I enjoy the convenience of not having wires or needing to take my headphones off to take a call or change music. I can put on my headphones and start my music without taking the phone out of my pocket, and if I get a call while I'm out, I can instantly take the call, without having to take off my gloves or anything. They're the best iPhone accessory I own.