How to find out/change my iphone 4s restriction code?

I've had about 8 failed attempts to guess the possible code that I may have set years ago. Can't figure out how to request a new code or get a reminder.

I'm looking in Settings>>General>>Restrictions

Im not 100% positive but i think you can connect to itunes from a pc and restore it. Or go to a carrier store and they can do it.