public function deleteIncoming($domain, $id)
    {
        if (!$domain)
            throw new BadMethodCallException('Parameter $domain is missing.');
        if (!$id)
            throw new BadMethodCallException('Parameter $id is missing.');
        try {
            $this->delete('sms/' . $domain . '/incoming/' . $id)->send();
        } catch (\Exception $e) {
            throw new SmsException($e->getMessage(), $e->getCode(), $e);
        }
        return true;
    }