Originally Posted by $$$

Well, There's audible tones that trick some payphones into crediting your call a quarter if you play the tone the payphone makes when you drop in a quarter. There's also tones to edit what a caller ID will read when you call somebody. My buddies have called me up as "911-420-1337" under the name "GOD" before. Also, They did this before services like covertcall.com existed.