I keep tapping on the icons but nothing happens. I can call out but not answer nor stop an incoming calll.
Drag the middle phone symbol over to the operation you want to do: drag to green icon if you want to answer, to red if you want to close the call and up to message if you want to send a message. This was my first smart phone and went for 5 days not being able to answer the phone because the minimanual that came with the phone just assumed I would know and did not explain it!!!!! I was tapping away like the icons were buttons on an analogue phone .... sillly meeeee