[header] How to hang up an incoming call on an iphone [title] Press the power button once to hang up your current call. [step] If you're using an iphone 6 or later, the button is on the right edge of the screen near the top. On earlier iphones, the button is on the top edge. 
[substeps] If you're using apple earbuds or a compatible headset with a microphone, press the microphone button once to disconnect the call. [title] Press the power button twice (quickly) to reject an incoming call.