public function getIncoming($domain, $id)
    {
        if (!$domain)
            throw new BadMethodCallException('Parameter $domain is missing.');
        if ($id !== 0 && !$id)
            throw new BadMethodCallException('Parameter $id is missing.');
        $id = intval($id);
        try {
            $r = $this->get('sms/' . $domain . '/incoming/' . $id)->send();
        } catch (\Exception $e) {
            throw new SmsException($e->getMessage(), $e->getCode(), $e);
        }

        return $r->getBody(true);
    }