GSM

The GSM logo is used to identify compatible devices and equipment. The dots symbolize three clients in the home network and one roaming client.^[1]

The Global System for Mobile Communications (GSM) is a family of standards to describe the protocols for second-generation (2G) digital cellular networks,^[2] as used by mobile devices such as mobile phones and mobile broadband modems. GSM is also a trade mark owned by the GSM Association.^[3] "GSM" may also refer to the voice codec initially used in GSM.^[4]

2G networks developed as a replacement for first generation (1G) analog cellular networks. The original GSM standard, which was developed by the European Telecommunications Standards Institute (ETSI), originally described a digital, circuit-switched network optimized for full duplex voice telephony, employing time division multiple access (TDMA) between stations. This expanded over time to include data communications, first by circuit-switched transport, then by packet data transport via its upgraded standards, GPRS and then EDGE. GSM exists in various versions based on the frequency bands used.

GSM was first implemented in Finland in December 1991.^[5] It became the global standard for mobile cellular communications, with over 2 billion GSM subscribers globally in 2006, far above its competing standard, CDMA.^[6] Its share reached over 90% market share by the mid-2010s, and operating in over 219 countries and territories.^[2] The specifications and maintenance of GSM passed over to the 3GPP body in 2000,^[7] which at the time developed third-generation (3G) UMTS standards, followed by the fourth-generation (4G) LTE Advanced and the fifth-generation 5G standards, which do not form part of the GSM standard. Beginning in the late 2010s, various carriers worldwide started to shut down their GSM networks; nevertheless, as a result of the network's widespread use, the acronym "GSM" is still used as a generic term for the plethora of G mobile phone technologies evolved from it or mobile phones itself.

^ Sauter, Martin (21 November 2013). "The GSM Logo: The Mystery of the 4 Dots Solved". Archived from the original on 4 March 2016. Retrieved 23 November 2013. [...] here's what [Yngve Zetterstrom, rapporteur of the Marketing and Planning (MP) group of the MoU (Memorandum of Understanding group, later to become the GSM Association (GSMA)) in 1989] had to say to solve the mystery: '[The dots symbolize] three [clients] in the home network and one roaming client.' There you go, an answer from the prime source!
^ ^a ^b "GSM Global system for Mobile Communications". 4G Americas. Archived from the original on 8 February 2014. Retrieved 22 March 2014.
^ "GSM BRANDS Trademark of GSM Sales LLC - Registration Number 5523328 - Serial Number 87703883 :: Justia Trademarks". trademarks.justia.com. Retrieved 9 February 2023.
^ "GSM Audio Codec: Vocoder: AMR, CELP etc .. » Electronics Notes". www.electronics-notes.com. Retrieved 9 February 2023.
^ Anton A. Huurdeman, The Worldwide History of Telecommunications, John Wiley & Sons, 31 July 2003, page 529
^ https://www.spglobal.com/marketintelligence/en/mi/country-industry-forecasting.html?id=106599197
^ https://www.3gpp.org/ftp/tsg_ran/tsg_ran/TSGR_08/Docs/PDFs/RP-000283.pdf

[1] Sauter, Martin (21 November 2013). "The GSM Logo: The Mystery of the 4 Dots Solved". Archived from the original on 4 March 2016. Retrieved 23 November 2013. [...] here's what [Yngve Zetterstrom, rapporteur of the Marketing and Planning (MP) group of the MoU (Memorandum of Understanding group, later to become the GSM Association (GSMA)) in 1989] had to say to solve the mystery: '[The dots symbolize] three [clients] in the home network and one roaming client.' There you go, an answer from the prime source!

[:1-2] "GSM Global system for Mobile Communications". 4G Americas. Archived from the original on 8 February 2014. Retrieved 22 March 2014.

[:0-3] "GSM BRANDS Trademark of GSM Sales LLC - Registration Number 5523328 - Serial Number 87703883 :: Justia Trademarks". trademarks.justia.com. Retrieved 9 February 2023.

[4] "GSM Audio Codec: Vocoder: AMR, CELP etc .. » Electronics Notes". www.electronics-notes.com. Retrieved 9 February 2023.

[5] Anton A. Huurdeman, The Worldwide History of Telecommunications, John Wiley & Sons, 31 July 2003, page 529

[6] ttps://www.spglobal.com/marketintelligence/en/mi/country-industry-forecasting.html?id=106599197

[7] ttps://www.3gpp.org/ftp/tsg_ran/tsg_ran/TSGR_08/Docs/PDFs/RP-000283.pdf

[1]

[2]

[3]

[4]

[5]

[6]

[7]