IPhone restrictions pass code?

I got a new iPhone 5 and I'm going through the settings and came across "Restrictions."

It asks me for a pads code but I don't know what it is… Is there a default? If so, what is it? I tries 0000 but it failed and now it says "1 failed attempt" or something like that.

I know that I have never set a code for it.

What could it be?

Just follow the details on this webpage and you should be alright.

You have to do it with an unencrypted backup though!

(Best answer?)