Samsung SGH-T639LSATMB - Manual (Page 58)

Understanding Your Phonebook 57
FDN Mode
3. Scroll to Service number by pressing the Up or Down Navigation key and
press the key.
The available service numbers are listed on the Service number display
screen.
4. Scroll through the numbers by using the Up or Down Navigation key.
5. To dial the number displayed, press the key.
6. Press the key to return to Idle mode.
Note: This menu is available only when your SIM card supports Service Dialing Numbers.