Nokia 6150 - Manual (Page 57)

Settings (Menu 4)
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Security Level (Menu 4-5-5)
This menu allows you to set the phone security level on to avoid
unauthorised use of the phone. You will need the security code to
set the security level. The available options are:
None , Memory
(security code is required when Phone Book memory is selected) and
Phone (security code required when a new SIM card is inserted).
NOTE: When you change the security level, all the
recent calls lists are cleared.
Change Access Codes (Menu 4-5-6)
With this menu you can change the access codes: security code, PIN
code, PIN2 code and barring password. These codes can only include
the characters 0 to 9. The phone prompts you to enter the current
code and the new code. It also prompts you to verify the new code
by entering it again.
NOTE: Avoid using access codes similar to the
emergency numbers, such as 112, to prevent
accidental dialling of the emergency number.
Phone Line Change (Menu 4-5-7)
You can allow or prevent the selection of a phone line.
When Not allowed is selected, you cannot use the ‘Phone line
in use’ function.
1 Once in the Security settings submenu, scroll with
or to Phone line change and press Select .
2 Key in the PIN2 code and press OK .
3 Scroll to Allowed or Not allowed and press OK .