You can switch applications during a call; for example, to look up information by using the Browser. The green phone icon appears in the Status bar while the call is underway.
To return to the Phone app while a call is in progress:
1Swipe down from the top of the screen to reveal your notifications.
2Touch the green phone icon.
To end a call in progress, touch the End Call icon 
at the bottom of the screen.
Related topics
Dial by voice
Options during a call
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