http://www.rd.com/content/printContent.do?contentId=43414

Experiment done with 900 'Lost' Cells in 32 International Cities – the 'Owner' rings and ask the finder to return it.

There is a graph and two surveillance Videos

And people call Mumbai the rudest city in India!

Vienna is #0 with 30/30! ;)

Interesting article :)
In my country a TV program did a similar test at beach: one person was walking some steps ahead a group of people, and throwed money "accidentally". Some people kept the money, and others returned it. I don't remember the percentages, though.