Acer S520 - Manual (Page 26)

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caller button or open the Application menu and tap Settings > More... > Call
settings and tap Float caller to enable or disable.
Answering or declining a call
When you have an incoming call, the number will be shown on the screen. To accept
or decline the call, tap the appropriate icon and slide your finger across the screen.
To decline the call with a text message, tap the icon and select a message.
Ending a call
To end a call, tap from the voice call screen.