See
Figure 1. When a call is initiated or accepted, the Call screen is displayed. This screen shows information for the current call.
While in an active phone call, you can change to other screens and use other features (such as navigation). However, other audio sources remain muted, paused or inaccessible until the phone call is finished.
Return to the Call screen to end the call or use other phone features. To return to the Call screen at any time during a call, press the Home switch twice.
Figure 1. Call Screen