"Brad du Plessis" <bradd@cat.co.za> writes:
>>> Most do.
>>
>> exactly. GPRS phones work with an extended version of the AT command set.
>
> I've tried both a 5140 and a 6100 and neither phone seems to respond
> to AT commands (confirmed in minicom). It seems as though the cable
> itself contains the USB-serial device and it gets detected as a USB -
> serial controller all on its own (without plugging the other end of
> the cable into the phone), maybe this is the problem.

As I said, I recommend listening in on the communications that happen
when you run the device under Windows. There are several programs you
can find online that interpose themselves into the Windows driver
chain and provide complete dumps of all the USB communications in
progress.

Perry