Samsung SGH-D500 Manual page 187

Settings
Privacy
(Menu 9.7.5)
Using this menu, you can lock your media contents, such
as multimedia messages, e-mails, images, videos, music
files, and sounds. Once you have locked the contents,
you must enter the phone's password to access the
associated menus.
To
select an item to lock
place or remove a check
mark
lock the marked items
When the phone asks for the password, enter the
password and press the OK soft key.
Note: The password is preset to "00000000" at the factory.
To change this password, see page 185.
SIM lock
When the SIM Lock feature is enabled, your phone only
works with the current SIM. You must enter the SIM lock
code to use a different SIM card.
Once you have entered the lock code, you are asked to
confirm it by entering it again.
To unlock the SIM, you must enter the SIM lock code.
186
(Menu 9.7.6)
Press the
Up or Down key. To lock all
contents, select All.
key.
Save soft key.