unlocking my blackberry 8520,,

[dcmc]

i got a my brothers old blackberry 8520.he doesnt know his pin code .how do i unlock it so i dont have to put in the code?
I WAS THEN TOLD TO:
enter the password wrong 10 times so the blackberry erases itself
I DID THAT AND THIS CAME UP ''puk blocked ,contact service provider'',
how do i get past this, SO I CAN USE IT??????? , I cant contact the service provider because its not registered in my name!!
thanks

[SwitchBeach]

Don't start a new thread.

unlocking my blackberry 8520