code: def create(self, phone_number_sid):
          
          data = values.of({'PhoneNumberSid': phone_number_sid, })
  
          payload = self._version.create(
              'POST',
              self._uri,
              data=data,
          )
  
          return PhoneNumberInstance(self._version, payload, service_sid=self._solution['service_sid'], )
docs: Create a new PhoneNumberInstance
  
          :param unicode phone_number_sid: Phone Number SID for the Phone Number being added to the Service.
  
          :returns: Newly created PhoneNumberInstance
          :rtype: twilio.rest.messaging.v1.service.phone_number.PhoneNumberInstance