I'm having the same issue.
I set the passcode quite some time ago when I was fiddling with security (I was paranoid and thought I was being charged by iTunes without doing anything). I've since forgotten the passcode and have 11 failed attempts, resulting a 60 minute ban on attempts each time. I don't have the time nor do I currently have the mental capacity to find this god forsaken arrangement of numbers.
This shouldn't be so difficult. Forgotten passcode? Fine! Contact Apple, have them verify your identity by other means (or whatever they need to do to make sure the passcode system retains integrity) and VOILA
I've downloaded all the programs mentioned in this thread. I've looked at the correct files and there is no trace of the PIN.
Where can I locate it? It is a huge inconvenience to have to completely wipe my phone and set it at as a new device. I'm a freelancer and alot of my livelihood sits in the curcuitry of this little rectangle. While that is not clever or ideal, that is currently the case and I do not have the time or resources to simply 'start again'.
I'm a big Apple fan - wouldn't normally hear a bad word about them but this is really not my cup of tea.
If it is no longer in under Library>Prefs and 'springboard' - WHERE is it?