Nokia 301 User Manual page 54

Access codes
PIN or PIN2 code
(4-8 digits)
54
These protect your SIM card against
unauthorised use or are required to
access some features.
You can set your phone to ask for the PIN
code when you switch it on.
If not supplied with your card or you
forget the codes, contact your network
service provider.
If you type in the code incorrectly three
times in a row, you need to unblock the
code with the PUK or PUK2 code.