Phone protection on K770i

[mitsos1os]

Hi guys. I am new at phone modding generally, and i haven't done anything on my phone except installing some java applications. I have K770i with the vodafone firmware. My problem is that it has the phone protection code enabled and it is not the factory default (maybe somebody smart put it for fun, i don't know :)). So i cannot use any other sim except mine. It is not the kind of lock that only works with vodafone sims (network lock). It's the phone protection that asks for a password when a different sim than the one already in, is inserted. It is located in Settings-Security-locks-phone protection. Anybody can help me finding a solution? Thank you very much...

PS:: I also searched the forum, but i didn't find anybody with the same problem.....