9.1.2 Announce and answer calls
You can use the Announce calls option to announce incoming calls through your headphones and answer them using voice control.
To have calls announced and answered
1 On your homescreen, tap .
2 Tap Siri & Search| Announce Calls.
3 Select the desired option:
*Always
*Headphones and car
*Headphones only.
If your iPhone is connected to headphones that support this option and a call comes in for you, Siri recognizes the party and asks if you want to answer it.
4 Say "Yes" to accept the call or "No" to reject the call.
*You are connected to the subscriber or the call is rejected.