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The iPhone headset has a multitude of functionality. The obvious ones are listening to music, and using it as a hands-free device when talking on the phone. However, the microphone also has a built-in button, which can do a lot of things:
- When listening to music, watching a video etc.:
- Single press: play/pause
- Two quick presses: next song
- When receiving a call:
- Single press: accept the call
- Long press: Reject call (this will be confirmed by two distinct, low beeps)
If you receive a call while already on a call, you can accept or reject as above, and if on two calls at once, a single press will switch to the other call, while a long press will hang up the active call. Whenever you hang up a call, this will be confirmed by the previously mentioned beeps.