Samsung GSM1800 - Manual (Page 114)

Phone Settings
114
Privacy (Menu 6.6.5)
Using this menu, you can lock your media contents,
such as multimedia messages, photos, videos,
sounds and images. Once you have locked the
contents, you must enter the phone password to
access the associated menus.
When the phone asks for the phone password,
enter the password and press the OK soft key.
Note: The password is preset to “00000000” at the
factory. To change it, see the Change
Password menu (Menu 6.6.4).
SIM Lock (Menu 6.6.6)
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.
To Press the
select an item to lock Up or Down key. To lock all
of the contents, select All.
place a check mark Mark soft key.
remove a check mark Unmark soft key.
lock the marked
items OK soft key.