Follow this procedure to place an international call using the dialpad on the Calisto P540-M phone.
1. Press the "0" button on the keypad for 1.5 seconds (you will see the "0" on the display change to a "+").
2. Key in the 12 digit international phone number.
3. Take the handset off of the phone.
The phone will automatically add the additional 9 digit code (country and other access codes) to the number keyed in and will dial the number.