Samsung SGH-T159YKBTMB - Manual (Page 122)

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Check PIN code
When the Check PIN code feature is enabled, you must enter
your PIN each time you switch on the phone. This means that
any person who does not know your PIN cannot use your
phone without your approval.
Note: You must enter the PIN code to enable or disable the
Check PIN Code feature.
1. From Home screen, press Menu (LSK) ➔ Settings ➔
Personalize ➔ Phone settings ➔ Security ➔ Check
PIN code.
2. Select Enable to have the phone prompt you for the PIN
each time you power it on.
– or –
Select Disable to have the phone connect directly to the
network when you power it on.
3. Press Save (LSK) to store your changes.
Change PIN code
This feature allows you to change your current PIN, provided
that the Check PIN code feature is enabled. You must enter
the current PIN before you can specify a new one.
Note: Pin lock must be enable before using this feature.
Once you enter a new PIN, you are asked to confirm the PIN
number by re-entering it.
Ⅲ From Home screen, press Menu (LSK) ➔ Settings ➔
Personalize ➔ Phone settings ➔ Security ➔ Change
PIN code.
Set FDN mode
FDN (Fixed Dialing Number) mode, if supported by your SIM
card, allows you to restrict your dialed calls to a limited set of
phone numbers.
1. From Home screen, press Menu (LSK) ➔ Settings ➔
Personalize ➔ Phone settings ➔ Security ➔ Set FDN
mode.
2. Choose one of the following options:
– Disable: you can call any number.
– Enable: you can only call phone numbers stored in Contacts.
You must enter your PIN2 code. You can obtain your PIN2 from
T-Mobile’s customer service.
3. Press Save (LSK) to store your changes.