Samsung SGH-X105NBATMB - Manual (Page 86)

Phone Settings
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This function is a memory aid, which you can use to check your
own phone numbers if you need to do so.
Any changes made here do not in any way affect the actual
subscriber numbers on your SIM card.
Language
You can select a display language. When the language option is
set to Automatic, the language is automatically selected
according to the language of the SIM card used.
Security
The Security feature enables you to restrict the use of your
phone to:
The people of your choice
The types of calls of your choice
Various codes and passwords are used to protect the features of
your phone.
PIN Check
When the PIN Check feature is enabled, you must enter your
PIN each time you switch the phone on. Consequently, any
person who does not have your PIN cannot use your phone
without your approval.
Note: Before disabling the PIN Check feature, you must enter your PIN.
To change your PIN, refer to the Change PIN menu option
(Menu 5.5.6).
The following options are available.
Disable: the phone connects directly to the network when you
switch it on.
Enable: you must enter the PIN each time the phone is
switched on.