Nokia 2160 Owner's Manual page 16

Note: Avoid using access codes similar to emergency
numbers such as 911 to prevent accidental dialing of
the emergency number.
Security Code (5 digits)
The Security Code comes with your phone and is
required with some phone features. Keep it secret and
in a safe place, separate from the phone.
You cannot change the Security Code. If you need a
new one, contact your dealer. The default is 12345.
If you enter an incorrect security code (CODE ERROR) five
times in a row, the phone won't accept any entries for
the next five minutes.
Lock Code
You need the 4-digit lock code to turn on the Automatic
Phone Lock in Menu 5 1, or to change the Lock Code
in Menu 5 2. The default Lock Code is 1234.
12
Enter the 5-digit code
F
then left ( OK ) at
Security Code: prompt.