If someone has demonstrated the ability to get your unlisted telephone number and make harassing calls (this goes beyond the normal defenses available to the consumer like Caller ID and anonymous call rejection), would switching to a cell phone solve the problem? Are cell phone numbers traceable in the U.S.? I don't mean by using *57. I mean, can you disappear in the telephone universe by using a "permanent" cell phone number as opossed to a discardable cell phone?