To end a call
Simply tap the End Key
on the Call screen to end
the call.
If you accessed other device functions while the call was in progress, there are several ways to return to the Call screen to end the call.
Tap (or press) the Home Key
, tap the Phone Key 
in the Quick Keys bar,
then tap the End Key on the Call screen.Tap(or press) the Home Key
, tap the Contact’s name
or number at the top right corner of the Home screen, then tap the End Key on the Call screen.Drag the Notifications panel down, then tap End call
.
NOTE
You can also press the Power/Lock Key 
on the right side of
the phone if you activated this feature in the settings.