code: def shared_cost(self):
          
          if self._shared_cost is None:
              self._shared_cost = SharedCostList(
                  self._version,
                  account_sid=self._solution['account_sid'],
                  country_code=self._solution['country_code'],
              )
          return self._shared_cost
docs: Access the shared_cost
  
          :returns: twilio.rest.api.v2010.account.available_phone_number.shared_cost.SharedCostList
          :rtype: twilio.rest.api.v2010.account.available_phone_number.shared_cost.SharedCostList