Fixed Dialling (Menu 4-5-3)
This service restricts your outgoing calls to selected phone numbers,
if this function is supported by your SIM card. To save and edit
numbers on the list, you will need to have the PIN2 code.
NOTE: When the Fixed Dial Option is set on, calls
may be possible to certain emergency numbers in
some networks (e.g. 112 or other official
emergency number).