I'm currently running GPRS / Siemens M50 / Prolific PL2303 USB/serial as my primary internet connection.
I only had to add usbserial and pl2303 modules and /sbin/chat program, with few scripts to use it as a primary connection.
As a fallback, you'll have to hack the original scripts much deeper, as the unit would probably try to reboot itself if it loses WAN.


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