The Miami Herald ran a story on Saturday which gives another example of why I laugh whenever anyone cites the non-existent "right" to privacy. Apparently insurance companies deny applicants based on the medications they are taking, even if those applying don't reveal that information. If you thought your medical information was private, think again. The Herald found that data-mining operations harvest information from pharmacies and other drug suppliers, and then sell that information to insurance companies, which use it to deny applications. If someone knows what drugs you are on, they know your medical conditions.
As a default position I assume that any information that passes through electronic media of any form, including the telephone, is not private. If someone wants it bad enough they can get it.