Christ, I hate speakerphone.
Nothing says “I’m much too important and busy to speak to you” than using speakerphone. It’s one thing if you’re someone who’s running around trying to get stuff done, like a mother with a toddler or a chef in a kitchen. It’s another if you’re sitting behind a desk. Either you want to give the impression you’re a very busy and important person, or you want to show off in front of coworkers that you can boss people around and how quickly they jump to your actions.
I don’t think I’ve used speakerphone once since I started working here some 18 months ago. However, I’ve gotten more than three speakerphone calls already today.