Samsung Galaxy S6 edge Instruction Manual page 183

Receiving incoming call while
application is activated
If an incoming call is received when an
application is activated, the call is displayed in a
pop-up dialog box.
• You can start/reject the call by tapping
"ANSWER"/"REJECT".
• You can reject a call and convey the reason for
rejecting the call to the caller with a message
by tapping "REJECT CALL WITH MESSAGE".
• Tapping displays the call in full screen view.
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Calling