Most common numeric passcodes →
Daniel Amitay’s iPhone app had a configurable 4-digit numeric lock screen, and he anonymously aggregated the passcodes that people set in his app for analysis:
Because Big Brother’s passcode setup screen and lock screen are nearly identical to those of the actual iPhone passcode lock, I figured that the collected information would closely correlate with actual iPhone passcodes.
This potentially shady data collection got him booted from the App Store (at least temporarily), but the data’s interesting.