Acer S510 - Manual (Page 23)

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default voice call screen. To do so, open the Notification area and tap the Float
caller button.
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.