code: def fetch(self):
          
          params = values.of({})
  
          payload = self._version.fetch(
              'GET',
              self._uri,
              params=params,
          )
  
          return NumberInstance(self._version, payload, number=self._solution['number'], )
docs: Fetch a NumberInstance
  
          :returns: Fetched NumberInstance
          :rtype: twilio.rest.pricing.v1.voice.number.NumberInstance