You know who I like talking to on the phone? Customer service people. If you're even the slightest bit friendly to them they're so appreciative. Just saying "thank you, you've been very helpful and answered all my questions" totally makes their day!
You know who I don't like talking to on the phone? People whose job isn't to talk to people on the phone and who seem like they'd rather be doing something else. If I was them, I'd feel the same way, and I feel like a total heel for taking up their time. Yerg...not my favorite.