[2] In 2008 Harald Welte and Dieter Spaar experimented with a base transceiver station from Siemens that was end-of-life and implemented the BSC side of the A-bis protocol, which eventually turned into OpenBSC.

[9][10] Since 2018 Osmocom software and Sysmocom hardware has been used in Villa Talea de Castro in Mexico to provide a cellular network to around 3500 people.

[13][14] OpenBSC was a project to develop a free software implementation of GSM protocol stack and elements.

[20] OsmocomBB is a free firmware for the baseband processor of mobile phones which handles the encoding and radio communication of both voice and data.

OsmocomBB is the only existing free implementation of baseband firmware, excluding failed projects like TSM30 from THC and MadOS.