public function sendSimple()
    {
        $this->setType(self::TYPE_SIMPLE);
        $response = $this->sendApiCall(self::ACTION_CREATE, $this->getCreateUrl());

        if (!isset($response->getBody()['_embedded']['items'])) {
            throw new Exception('Invalid response returned from server', Exception::INVALID_RESPONSE);
        }

        $result = array();
        foreach ($response->getBody()['_embedded']['items'] as $item) {
            $result[] = $sms = new Sms($this->client, $this->factory);
            $sms->setFields($item);
            $sms->setType(self::TYPE_SIMPLE);
        }

        return $result;
    }