Before Christmas I was speaking with two colleagues and recent iPhone adopters about headphones. They were examining my Sony MDR-EX71s (white, short cable) connected to Griffin SmartTalk. I mentioned the SmartTalk gives third-party headphones a button and microphone. I was asked if you could answer calls with the button to which I said, "yes, it does all the same things as the included headphones". To which the reply was, "the included ones have a button?". Yep they certainly do.
The headset included with iPhone features a microphone and an integrated button that allows you to answer and end calls easily, and control audio and video playback. Plug in the headset to listen to music or a phone call. Callers hear you through the headset microphone. Click the mic button to control music playback and answer or end calls, even when iPhone is locked.
Stereo Headset with mic These are the functions that can be performed with the mic button:
Pause a song or video Click the mic button once. Click again to resume playback.
Skip to the next song Click twice quickly.
Skip to the previous song Click three times quickly.
Answer an incoming call Click once.
End the current call Click once.
Decline an incoming call Press and hold for about two seconds, then let go. When you let go, two low beeps confirm you declined the call.
Switch to an incoming or on-hold call and put the current call on hold Click once. Click again to switch back to the first call.
Switch to an incoming or on-hold call and end the current call Press and hold for about two seconds, then let go. When you let go, two low beeps confirm you ended the first call.