The phone goes to my left ear without even thinking about it. It just seems most natural. Maybe it does have something to do with being right handed, but maybe not since Region is also right handed but holds it to the opposite side.
CL, it must be nice to have a headset! When I was working, I was on the phone sooo much and was always asking for a headset. Cheap bastids I worked for though said, "just put it on speaker phone". Not a wise idea when I was speaking money matters with my suppliers. They just didn't get it.