Instructions
Gently tap the "Up" button to bring up the mobile phone. You'll use the lower-directional pad with the Xbox 360 and the standard directional pad with the PlayStation 3. After pressing up, you'll see the phone appear in the lower-right portion of the screen.
Press the "Up" button again to access your keypad. If you wish to adjust your phone's settings, or call a number in the phone book, press "Down" instead.
Select the digits for the phone number you want to call. Enter the buttons and select the "Call" button to place your call.