Samsung note 2 Quick Start Manual page 37

To return to your original call:
X Tap
Swap Swap
call. This places the new caller on hold and
activates the previous call.
To alternate between calls:
X Tap
Swap
Swap
calls.
IMPORTANT: The currently active call is displayed as a large
on-screen Contact image.
(Swap) to switch to the original
(Swap) to alternate between the two
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