This one will require you to make some “tweaks” on your friend’s cell phone.
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.