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Call control: control calls with your headphones | iOS 11 Guide

The headphones that come with an iPhone have a built-in microphone for hands-free calling. The middle is also a remote button – if you squeeze it you’ll hear a click.

If the headphones are plugged in when the phone is ringing, click the button once to answer the call. To reject the call, press and hold the button for two seconds, then release it. At the end of a phone conversation, click once to end the call.

More call controls

If you’re already on a call and another one comes in, you can click the remote button once to switch to the new call. Click again to go back to the original phone conversation.

To end the current call before switching, press and hold the button for two seconds then let go.

Of course, you can also use the volume buttons to easily change the volume during a phone call.

Change call volume with headphone buttons