Anyone tried connecting to
http://192.168.4.1 (or whatever your gateway address may be but I assume it's going to be the same for everyone) through your phone or tablet and taking a look at the settings of the WiFi-serial bridge of this device? If you were driving down the road, it seems someone could easily connect and change the AP settings for this dongle if the network is left insecure and leave you without a working device. (Edit: you may need to turn airplane mode on to disable cellular and then Wi-Fi back on for this to work)
Might be best to secure the device after you get it by changing the SSID and setting WPA2 encryption.
Can someone from MHD chime in on this? Since no instructions come with the device (after all, it does plug & play well), it seems concerning that the security of the device hasn't been talked about.