Samsung SPH-A640 Phone Manual page 82

Restriction
Allows you to restrict outgoing call options by selecting one
of the following options:
Allow all to allow outgoing calls to be made (no
restrictions).
Contacts only to allow outgoing calls to only those
numbers saved in the Contacts list.
Special# only to allow outgoing calls to only the numbers
set up in the special numbers list. (See "Using Special
Numbers" on page 66.)
To access call restriction:
1.
Select Menu > Settings > Others > Call Setup >
Restriction.
2.
Enter your lock code.
3.
Select Outgoing Call and press
4.
Select Allow all, Contacts only, or Special# only and
press
60
.
.