2G

2G (or 2-G) is short for second-generation cellular network. 2G cellular networks were commercially launched on the GSM standard in Finland by Radiolinja (now part of Elisa Oyj) in 1991.[1]

Three primary benefits of 2G networks over their predecessors were:

  1. Digitally encrypted phone conversations, at least between the mobile phone and the cellular base station but not necessarily in the rest of the network.
  2. Significantly more efficient use of the radio frequency spectrum enabling more users per frequency band.
  3. Data services for mobile, starting with SMS text messages.

2G technologies enabled the various networks to provide services such as text messages, picture messages, and MMS (multimedia messages).

After 2G was launched, the previous mobile wireless network systems were retroactively dubbed 1G. While radio signals on 1G networks are analog, radio signals on 2G networks are digital. Both systems use digital signaling to connect the radio towers (which listen to the devices) to the rest of the mobile system.

With General Packet Radio Service (GPRS), 2G offers a theoretical maximum transfer speed of 40 kbit/s.[2] With EDGE (Enhanced Data Rates for GSM Evolution), there is a theoretical maximum transfer speed of 384 kbit/s.[2]

The most common 2G technology was the time division multiple access (TDMA)-based GSM, originally from Europe but used in most of the world outside Japan and North America. In North America, Digital AMPS (IS-54 and IS-136) and cdmaOne (IS-95) were the main systems. In Japan, the ubiquitously deployed system was Personal Digital Cellular (PDC).

Evolution

2.5G (GPRS)

2.5G ("second and a half generation"[3]) is used to describe 2G-systems that have implemented a packet-switched domain in addition to the circuit-switched domain. It doesn't necessarily provide faster service because bundling of timeslots is used for circuit-switched data services (HSCSD) as well.

2.75G (EDGE)

GPRS networks evolved to EDGE networks with the introduction of 8PSK encoding. While the symbol rate remained the same at 270.833 samples per second, each symbol carried three bits instead of one. Enhanced Data rates for GSM Evolution (EDGE), Enhanced GPRS (EGPRS), or IMT Single Carrier (IMT-SC) is a backward-compatible digital mobile phone technology that allows improved data transmission rates, as an extension on top of standard GSM. EDGE was deployed on GSM networks beginning in 2003, initially by AT&T in the United States.

Phase-out

2G, understood as GSM and CDMA, has been superseded by newer technologies such as 3G (UMTS / CDMA2000), 4G (LTE) and 5G; however, 2G networks are still used in most parts of Europe, Africa, Central America and South America,[4][5][6] and many modern LTE-enabled devices are known to still fallback to 2G for phone calls, especially in rural areas.[7] In some places, its successor 3G is being shut down rather than 2G – Vodafone announced that it will switch off 3G across Europe in 2020 but retain 2G as a fallback service.[8]

Various carriers have made announcements that 2G technology in the United States, Japan, Australia, and other countries is in the process of being shut down, or have already shut down 2G services so that carriers can reclaim those radio bands and re-purpose them for newer technologies (e.g. 4G LTE).[9][10]

Criticism

In some parts of the world, including the United Kingdom, 2G remains widely used for dumbphones, and for internet of things (IoT) devices where the high patent licensing cost of newer technologies makes them prohibitive, such as smart meters, eCall systems and vehicle tracking devices.[11][8][12] Terminating 2G services could leave vulnerable people who rely on 2G infrastructure without means to access emergency contacts, leading to preventable deaths.[12]

Past 2G networks

Country Network Shutdown date Standard Notes
 Australia Optus 01.08.2017 GSM 2G shut down in WA and NT on 3 April 2017.[13][14]
Telstra 01.12.2016 GSM [15]
Vodafone 30.06.2018 GSM
 Canada Bell 30.04.2019 cdmaOne Shutdown of CDMA transmitters began in remote areas in 2017, followed by an official announcement in June 2018
that 2G devices will loose service soon.[16][17]
Rogers Wireless 31.12.2021 GSM Initially announced for 2018, the 2G network shut-down was later pushed back to 31 December 2020.
In July 2020 this date was postponed for another year.[18][19]
SaskTel 31.07.2017 cdmaOne [20][21]
Telus 31.05.2017 cdmaOne [22][23]
 China China Unicom 2021 GSM [24][25]
 Japan au KDDI 31.03.2008 cdmaOne
NTT Docomo 31.03.2012 PDC [26]
Softbank 31.03.2010 PDC [27]
 Macau China Telecom 2010 cdmaOne [28]
CTM 01.08.2019 GSM Service for local customers terminated on 4 June 2015 with network service remaining for roaming users.[29][28]
3 01.08.2019 GSM Service for local customers terminated on 4 June 2015 with network service remaining for roaming users.[29][28]
SmarTone 01.08.2019 GSM Service for local customers terminated on 4 June 2015 with network service remaining for roaming users.[29][28]
 Netherlands T-Mobile 01.06.2021 /
15.11.2023 (IoT)
GSM [30]
 New Zealand 2degrees 15.03.2018 GSM [31]
Spark 31.07.2012 cdmaOne [32][33]
 Singapore M1 18.04.2017 GSM [34]
Singtel 18.04.2017 GSM [34]
StarHub 18.04.2017 GSM [34]
 South Korea KT 19.03.2012 cdmaOne [35]
LG Uplus 30.06.2021 cdmaOne CDMA2000 1xRTT, EV-DO Rev. A/B (3G) service will also terminate.[36]
SK Telecom 27.07.2020 cdmaOne [37]
  Switzerland Salt since 01.07.2020 GSM As of December 2020 network coverage almost completely vanished with single sites in remote areas remaining
until local 4G coverage becomes available.[38][39][40]
Sunrise 31.12.2022 GSM Originally announced for the end of 2018, with the introduction of S-RAN phaseout was postponed to 2022.[41][42]
Swisscom since 01.01.2021 GSM Official shutdown date was on 31.12.2020 (service guarantee)[43]
 Taiwan Chunghwa Telecom 30.06.2017 GSM [44]
FarEasTone 30.06.2017 GSM [44]
Taiwan Mobile 30.06.2017 GSM [44]
 United States AT&T 01.01.2017 GSM [45]
T-Mobile since 01.01.2021 GSM
T-Mobile (Sprint) 2022 cdmaOne CDMA2000 1xRTT, EV-DO Rev. A (3G) service will also terminate.[46]
Mexico AT&T Mexico 2020 AT&T Mexico has started the shutdown of their 2G network on the country.[47]
Movistar Movistar Mexico started the shutdown of their 2G network in April 2019.[48]

See also

References

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  2. "GPRS & EDGE". 3gpp.org. Retrieved 17 August 2019.
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  46. "T-Mobile aiming to shut down legacy Sprint networks in 2022". TeleGeography. 10 December 2020. Retrieved 23 January 2021.
  47. "Most used 2G mobile phones in India". Comparetrap.
  48. Escalona, Claudia Juárez. "Movistar y AT&T ponen en marcha apagón 2G". El Economista. Retrieved 26 March 2019.
Preceded by
1st Generation (1G)
Mobile Telephony Generations Succeeded by
3rd Generation (3G)
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