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13-12-2013 15:17 - edited 13-12-2013 15:19
If your Sim is blocked you can still use your phone by inserting another SIM.
PIN and PUK are two different codes, PIN is 4 digit and PUK is 8 digit. PIN has 3 attempt beyond which it will ask PUK. While PUK has 10 attempts, beyond 10 wrong entries it will block SIM.
Your SIM wasnt PIN protected as you say, but for some reason your phone may have asked you to enter PUK. (which you seem to have mistaken it for PIN)
If you have forgotten your PIN/PUK number, call the carrier helpline and they will help you.
Nokia supply SIM-free handsets to the networks, which then decide whether and how to lock them. Both the unlock codes and the unlock procedures are owned by the networks, not by Nokia. Nokia cannot do anything about unlocking a handset, it is 100% up to the network which has locked it, therefore you should pursue the issue further direct with Vodafone, preferably in person in a Vodafone shop.