Figure out which is your friend’s favorite song and then insist that they make that the ringtone for when you call them. The thinking behind this is: if your ringtone is their favorite then they’ll subconsciously be hoping that you call them all the time. Gateway to Cool.
If that song’s “unavailable”, here are a couple of ringtones that are sure to bring a smile to a phone owner’s face: Sweet Child of Mine, This is Why I’m Hot, One Love, Paper Planes, The Corner, Back in Black.
The true magic happens when you call your friend and they’re with a bunch of other people. Now a whole group suddenly knows you’re cool. Mass marketing.