Perform a Yelp Phone API Search based on phone number given.

        Args:
          phone    - Phone number to search by
          cc       - ISO 3166-1 alpha-2 country code. (Optional)

def by_phone(self, phone, cc=None):
        """
        Perform a Yelp Phone API Search based on phone number given.

        Args:
          phone    - Phone number to search by
          cc       - ISO 3166-1 alpha-2 country code. (Optional)

        """

        header, content = self._http_request(self.BASE_URL, phone=phone, cc=cc)
        return json.loads(content)