public function sendSms($toNumber, $message)
    {
        if (empty($this->has_sms)) {
            throw new Exceptions\NoSmsException("Device cannot send SMS messages.");
        }

        $data = [
            'type' => 'push',
            'push' => [
                'type'               => 'messaging_extension_reply',
                'package_name'       => 'com.pushbullet.android',
                'source_user_iden'   => (new Pushbullet($this->apiKey))->getUserInformation()->iden,
                'target_device_iden' => $this->iden,
                'conversation_iden'  => $toNumber,
                'message'            => $message
            ]
        ];

        return new Push(
            Connection::sendCurlRequest(Connection::URL_EPHEMERALS, 'POST', $data, true, $this->apiKey),
            $this->apiKey
        );
    }