ip pass code
My iPad had an alphanumeric passcode as standard for some reason. But my wife's iPad has the 4 pin code feature you are referring to. The difference between the two ipads? Mine was from America, my wife's from Australia...
So obviously there is a way to change it, but I have no idea how. If anybody else does, please let me know, as my wife would like to use alphanumeric instead of the simple pin code.