http://www.we-make-money-not-art.com/archives/003095.php
This looks pretty relevant to (what I alone am probably still referring to as) the SMS impalla project. MIght be worth a look...
"allow[s] people to snoop into fellow travelers mobile phones and read text messages, view images and listen to conversations while traveling. The MSS was available on trial on bus nr.52 in London earlier this year."