Samsung SM-S766C User Manual page 52

Multitasking While on a Call
If you exit the call screen and return to a Home screen,
your active call is indicated by an icon on the Status bar.
This lets you continue with your current call and do
something else, such as access the contacts list, view a
recent email, locate a picture, and so on.
To return to the call screen:
► Swipe the Status bar downward to reveal the
Notification Panel, and then tap
To end a call from any application:
► Swipe the Status bar downward to reveal the
Notification Panel, and then tap End.
Calling
Call screen.
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Making and Answering Calls