Last month I wrote about what I consider a clever free iPhone 4 app that takes a photo of the person entering an unlock code into it.

Big Brother Camera Security: Take Photos of People Messing With Your iPhone 4

TheNextWeb reports that the app’s developer has been anonymously tracking the four-digit passcodes that people use with his app. Information about 204,508 passcodes were analyzed to reveal the most common passcodes used on the iPhone 4.

1234 is the most common iPhone passcode, app developer reveals

As TheNextWeb reports, “1234″ was the most popular passcode used. It was used by 4.3% of the app’s users. The other popular passcodes were:

0000
2580 (4 middle column digits)
1111

In all, the top 10 most commonly used passcodes (including the four described above) where used by 10% of the app’s users.