My nieces were playing with Siri/phone and accidently set up a passcode on my phone, I can't unlock or open etc. Apple is no help at this moment.
Tried troubleshooting with iTunes, but an error message states the iPhone can not be syncked because passcode is locked.,
The easiest solution and apparently the only approved solution via Apple (although a pain if you haven't backed up your device) to restore the phone if you can't figure out the passcode. It will erase everything but if you have a fairly recent backup then you will be fine...you may only lose anything that was added after the last backup. You can also try searching the Apple Support pages and forum to see if there is another solution. Ultimately, it's a plus to a certain degree that there is no easy way to change the passcode....if someone "found" it and wanted to try to get in to it....but it's a pain when it's a situation like yours.
http://manuals.info.apple.com/en_US/iphone_user_guide.pdf pg 165