Google has dropped the phonebook: and rphonebook: operators for finding phone numbers (rphonebook: was for "residential phonebook" and focused on home phones). Why?
"Because, it was the "endless source of hassles for people." Who were surprised to see themselves searchable on Google and for Google who had to constantly deal with all of the "takedown requests and outraged letters" from folks who thought they were unlisted," explains Daniel Russell.
However, you can still get the telephone number, providedly you put in a person's full name and zip, then the Phonebook onebox will trigger and show the phonebook info: