Called (one ring), Answered but did not talk, hangs up. This is a computer calling people. Collection agency's like to play a game with you. They set there computer to call you, ring one time then hang-up. Your phone will not get the caller ID on one ring, so they are free of any liability. They ring you once and hang up, doing this many times and all hours. They do this just to bug you and there is nothing you can do about it because you don't normally get an ID, They need to change how Caller ID works.