Fixed dialling (Menu 4-6-4)
This service restricts your outgoing calls to selected phone numbers,
if this function is supported by your SIM card. To set this function
on or off, or to save, edit or erase the numbers on the list, you need
to have the PIN2 code.
NOTE: When Fixed Dial Option is set on, calls may be
possible to certain emergency numbers in some networks
(e.g. 112, 911 or other official emergency number).