Other Telephone Weirdness

It just occurred to me that, not only do Koreans not have voicemail or answering machines, but they also don't say "goodbye" before hanging up the phone. They just kind of finish what they're saying and hang up. The closest I've seen to a closing like we do is "ne," which is just "yes." It's so counterintuitive. At least they say something in the beginning: "Yeoboseyo?"