What do I do if I can't get into my locked iPhone 4S? (iOS 6)?

I put a lock on my iPhone because my sister found out what the last lock combination was. The new one was perfect since she would never be able to guess it! But it was so good that I forgot it. I there any way I can get in and change the password even if its locked?

Same thing happened to me… You have to take it into where ever you bought it and they can fix it