What do do if you’ve forgotten your iPhone’s passcode

http://www.lifehacker.com.au/2011/10/what-to-do-if-youve-forgotten-your-iphones-passcode/

Of course, this works with your iPad or iPod Touch too.

What to do if you’ve forgotten your Android phone’s passcode

http://www.lifehacker.com.au/2011/10/what-to-do-if-youve-forgotten-your-android-phones-passcode/