To use features during a call, press the button on the screen. Use the volume buttons to control
the call volume.
How to use
Go to Apps ▶ Settings ▶ Networks ▶ Call ▶ Check the Power button. Now you can use the
Power button to end a call.
You can use recording, dial pad, speakers, mute or Bluetooth during a call by tapping each.
Tab the button at the top right with three dots to see menu.