PIN blocked

I don't know what happened, all I know is that the phone is asking me for a "PUK:" and the screen is titled "PIN blocked"

It is asking for some kind of password, but I don't know the password... what should I do?

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call ur cellphone operator (cingular, verizon, etc.) your cellphone is locked now because you had the security function on, and that wasn't the correct password. and u kept on pressing **** in.