My mobile phone has a 206 area code (Seattle). People sometimes ask me why I don’t have a 617 number (Boston/Cambridge). In fact, I had a Massachusetts number in college but switched to a 206 several years ago on a trip back home in order to get a "permanent" Seattle number.
With a move to mobiles phones, the idiosyncratic fact that US mobiles remain tied to geographic area codes, and the effective elimination of domestic roaming and long-distance, an area code in the United States is increasingly not about where you are but about where you are from. Or, perhaps more accurately, about where you want people to think you are from.