small footprint device for USSD/SMS

Dan Williams dcbw at
Mon Aug 3 15:37:15 PDT 2015

On Mon, 2015-08-03 at 22:00 +0100, João M. S. Silva wrote:
> Hi,
> Sorry about the newbie question:
> Do you know of any modular device to run USSD sessions? And eventually 
> By modular I mean not a USB dongle, but a smaller PCB which I can embed 
> in my machine instead of plugin it, hanging outside.
> Does modemmanager support USSD commands?

ModemManager supports USSD for modems that allow USSD control via the
standard 3GPP TS 27.007 AT commands (eg, +CUSD and others).  It does not
yet support USSD via QMI or MBIM, or modems that have other
non-standard-AT-based mechanisms for USSD.


> Or should I use other software? Or maybe I have to use AT commands 
> directly without any other abstraction layer?
> Thanks for any insights.
> For the moment I've been using an HSPDA dongle with which I send SMS, 
> but I'd like to embed this dongle inside the machine (in a PCB cape) and 
> also support USSD sessions.

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