code: def contact_number(self):
          
          try:
              number = self._ad_page_content.find(
                  'button', {'class': 'phone-number'})
              return (base64.b64decode(number.attrs['data-p'])).decode('ascii')
          except Exception as e:
              if self._debug:
                  logging.error(
                      "Error getting contact_number. Error message: " + e.args[0])
              return 'N/A'
docs: This method returns the contact phone number.
          :return: