public function addSms(SmsActivity $activity): SmsActivity
    {
        @trigger_error(sprintf('The %s() method is deprecated since version 0.8. Use SmsActivityApi::create() instead.', __METHOD__), E_USER_DEPRECATED);

        /** @var SmsActivityApi $apiHandler */
        $apiHandler = $this->closeIoApiWrapper->getSmsActivitiesApi();

        return $apiHandler->create($activity);
    }