It is one of the most common problems of Nokia Mobile users i.e. when they forget the Security code of their mobile they only have a solution that is to go to mobile Service center. Some of the users search solution of this problem on Google (i.e. how to reset the security code of Nokia mobiles). And they find several articles or tutorial on the same, but none of the tutorial works. Some of the site suggests Master Code which really does not works in every phone.