What to do on restriction pass code lock on iPhone 4S?

I don't remember turning on the restriction button or putting a pass code on my iphone 4s. Anyone know what do or maybe unlock it? I need to reset my phone because every sound on my phone is muted somehow. I know it's not the side button thing that turn off sound. Any help will be much appreciate.

If you don't know the passcode thats an issue you can't fix it without reseting it if you want to reset it plug it into computer go to itunes back it up and the.go to the itunes screen not the library it shows you the usage and hit reset

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