Popularity Dialer

Too bad this is only for the US, would be great to prank your friends with a call from it.

"Have you ever been in a situation where you wished your cell phone would ring? Maybe you wanted to look extra important or popular on that hot date. Or maybe you just needed an excuse to escape from an unpleasant meeting.
With "The Popularity Dialer", you can plan ahead. Via a web interface, you can choose to have your phone called at a particular time (or several times). At the elected time, your phone will be dialed and you will hear a prerecorded message that's one half of a conversation. Thus, you will be prompted to have a fake conversation and will easily fool those around you. "

for US only and you can read more here...