It is also not too hard to follow the instructions here:

http://bb.osmocom.org/trac/wiki/Software/GettingStarted

summarized:
- install some packages via your linux distribution
- get, build and install libosmocore
- build a gnu arm toolchain
- get, build and use osmocom-bb firmware and tools

A good list of hardware and their quirks is here:

http://bb.osmocom.org/trac/wiki/Hardware/Phones

-Craig

From: Dean Pierce <pierce403@gmail.com>
To: Tobias XY <baumi525@googlemail.com>
Cc: baseband-devel@lists.osmocom.org
Sent: Tuesday, June 23, 2015 5:21 PM
Subject: Re: Beginning with a Motorola C121 or C139

Also, when you boot the stick, make sure to boot to "persistent mode"
so all the tools are there.

  - DEAN



On Tue, Jun 23, 2015 at 3:20 PM, Dean Pierce <pierce403@gmail.com> wrote:
> Hey Tobi, I made a boot image that might help.
> https://mega.co.nz/#!uFIzxLxA!Bx-oMpZkKT_M3JEEruN5gzgGEhy_pkGmhp0uZWh9kjI
>
> It's essentially Kali with all the osmocom tools set up and good to
> go.  All the scripts are built for a C139.
> Take a 16+ gig USB stick, and  bunzip TWILIGHTVEGETABLE-1.0.img.bz2 >
> /dec/sdd  (or whatever your USB stick is)
>
> Once you boot, plug in the phone, run  ./rssi.sh  to run the rssi app
> described here:
> https://bb.osmocom.org/trac/wiki/rssi.bin
>
>  - DEAN
>
> On Tue, Jun 23, 2015 at 1:26 PM, Tobias XY <baumi525@googlemail.com> wrote:
>> Hello list,
>>
>> i´m new here and i want to begin with the project osmocom on the Motorola
>> C121 or C139. I have both mobile phones here and the USB to TTL Plug with
>> the cable. How can i start now. Is there a tutorial?
>>
>> Greetings,
>> Tobi