def fetch(self):
        """
        Fetch a AssignedAddOnInstance

        :returns: Fetched AssignedAddOnInstance
        :rtype: twilio.rest.api.v2010.account.incoming_phone_number.assigned_add_on.AssignedAddOnInstance
        """
        params = values.of({})

        payload = self._version.fetch(
            'GET',
            self._uri,
            params=params,
        )

        return AssignedAddOnInstance(
            self._version,
            payload,
            account_sid=self._solution['account_sid'],
            resource_sid=self._solution['resource_sid'],
            sid=self._solution['sid'],
        )
Fetch a AssignedAddOnInstance

        :returns: Fetched AssignedAddOnInstance
        :rtype: twilio.rest.api.v2010.account.incoming_phone_number.assigned_add_on.AssignedAddOnInstance