Accessing the firmware of osmocom-bb compatible phone

Rusty Dekema rdekema at gmail.com
Sat Apr 12 18:15:40 UTC 2014


> I am, however, pursuing a project seeking to put together a new
> firmware for Calypso-based "dumbphones" that would function just like
> the original proprietary fw, intended for using the phone "normally"
> as an everyday phone, unlike OsmocomBB which is intended for hacking
> and security research instead.  FreeCalypso is the name of my project,
> and it's being developed in this Mercurial repository:

I am very excited to hear about this project. If it is possible to
alter the 45 MHz tx/rx separation of the E-GSM-900 band on both a
handset and BTS, I believe that in conjunction with a few other
modifications, it might be possible to legally run a GSM network in
the ITU Region 2 33 cm amateur band. While not necessarily especially
practical, that could be a fun little project.

Once I get layer23/mobile working, I plan to test this in conjunction
with calypso-bts. If it works, it would be cool to be able to do it on
an untethered handset.

Rusty D




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