I was musing earlier today that because my 4G mobile broadband dongle is actually an embedded Linux device, which you can telnet into and log into as root (if you know the password), it's likely that it could be taken over.
I just logged into it and confirmed that the telnet connection is listening on "any" address, not just the USB interface. In other words, you may be able to telnet into this device through the mobile interface... from the internet...
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