For more information on your device, select it on the Support main page.
To view the call duration for the last call, or total duration of received calls, dialled calls and all calls, select Menu > Log > Call duration.
To view the call duration during the call, select Menu > Tools (or Settings or Ctrl. panel) > Settings > Phone > Call > Show call duration > Yes before the call. When there is an active call, you can see the call duration in idle mode.