What Is 2G? The History of 2G Mobile Networks Explained
GSM • SMS • GPRS • EDGE • UK 2G SWITCH-OFF
2G means second-generation mobile network technology.
It marked the move from the analogue cellular systems associated with 1G to digital mobile networks. In the UK and much of Europe, 2G is most closely associated with GSM, which brought digital voice, SMS and later basic packet-data services to mass-market mobile networks.
Commercial GSM entered service in 1991. The first SMS followed in 1992, while GPRS and EDGE later extended GSM with mobile data before 3G, 4G and 5G took over the high-speed internet role.
What is 2G?
The “G” in 2G stands for generation. It does not mean gigabit, gigabyte or GHz.
2G describes the second generation of cellular mobile technology. Compared with the analogue systems that came before it, 2G moved mainstream mobile communications onto digital radio networks.
Calls moved from analogue cellular systems to digital network technology.
The GSM generation provided the platform that made text messaging a mass-market service.
Later upgrades such as GPRS and EDGE added packet-data capability to GSM networks.
GSM and 2G are related, but they are not identical terms. 2G is the generation. GSM is one technology family within that generation, although it became the dominant 2G system in the UK, Europe and many other countries.
For the standards-development story and the people involved in creating GSM, see our separate guide to who invented 2G.
Before 2G: the 1G mobile era
First-generation cellular networks were analogue systems built mainly around voice calling. Different countries and regions used different standards, which made international compatibility more difficult.
Analogue cellular
- •Analogue voice communication
- •Different regional mobile standards
- •No mainstream SMS ecosystem
- •No modern packet-data mobile internet
Digital cellular
- ✓Digital voice services
- ✓A common GSM platform across many countries
- ✓SMS text messaging
- ✓Later packet-data upgrades
1991: commercial GSM begins
GSM moved from standards work into commercial operation in 1991. Ericsson’s history records that on 1 July 1991, Radiolinja in Finland launched a commercial GSM network when former Finnish prime minister Harri Holkeri made a public call from Helsinki to Kaarina Suonio in Tampere.
The importance of GSM was not just that calls were digital. It was designed as a common European platform that could be adopted across many networks and countries. That helped compatible equipment, subscriber identity through SIM cards and international roaming develop on a much larger scale.
1992: the first SMS
On 3 December 1992, software engineer Neil Papworth sent the first SMS from a computer to Vodafone director Richard Jarvis. The message was “Merry Christmas”.
Text messaging did not become universal overnight. Vodafone notes that cross-network texting arrived later, but SMS eventually became one of the defining services of the 2G era and influenced how people communicated long before modern messaging apps existed.
GPRS and EDGE bring data to 2G
Early GSM was centred on voice and messaging. Later upgrades added packet-switched data, making basic email, web access and connected-device services more practical.
Often called 2.5G
General Packet Radio Service added packet-data capability to GSM networks. Instead of treating every data session like a traditional circuit-switched call, it allowed mobile devices to send and receive data in packets.
Often called 2.75G
Enhanced Data rates for GSM Evolution improved data performance further. It was still far slower than later 3G and 4G services, but it extended what GSM networks could do.
These labels are useful historical shorthand rather than separate numbered mobile generations. Both technologies remained part of the wider GSM family.
What came after 2G?
| Generation | Main change | Historical role |
|---|---|---|
| 1G | Analogue cellular voice | The first generation of commercial cellular mobile networks. |
| 2G | Digital calls, SMS and later basic packet data | Created the mass digital mobile ecosystem and global GSM roaming platform. |
| 3G | Much more capable mobile data | Made mobile web browsing and early smartphone internet more practical. |
| 4G | High-speed packet-based mobile broadband | Made streaming, app-heavy smartphones and VoLTE mainstream. |
| 5G | Higher capacity and newer radio/core architecture | Expands mobile broadband capacity and supports newer consumer and industrial uses. |
2G did not disappear when 3G launched. Mobile operators often ran several generations at the same time, which is why GSM networks survived for decades after newer technologies became available.
Why did 2G last so long?
2G stayed useful because many devices do not need fast mobile broadband. A basic phone making calls and sending texts can work perfectly well without 4G or 5G speeds.
Consumer devices
Older feature phones and basic handsets remained useful for calls and texts, while some newer devices continued using 2G as a fallback.
Embedded equipment
Alarms, telecare products, payment terminals, trackers, telemetry systems and other machine-to-machine equipment can remain installed for many years.
That long equipment life is one reason operators have had to plan 2G retirement carefully rather than simply switching the network off as soon as newer generations became available.
When is 2G being switched off in the UK?
The UK’s major 3G networks have already closed. The next legacy-network transition is 2G, but the remaining networks are not all switching off at the same time.
| UK network | Current 2G retirement timing | Position as of 15 Sept 2026 |
|---|---|---|
| EE | Nationwide retirement from May 2029 | EE says it will begin closing its 2G network from May 2029, with preparation and customer support beforehand. |
| Virgin Media O2 | Switch-off starts summer 2029 | Virgin Media O2 announced in July 2026 that it will start retiring 2G in summer 2029. |
| VodafoneThree | Spring 2030 | VodafoneThree says the Vodafone 2G network will be switched off in spring 2030, with earlier local trials possible. |
| UK-wide latest point | By 2033 | UK operators committed to the Government not to continue 2G beyond 2033. |
Three did not operate a separate 2G network before the VodafoneThree merger, so the announced VodafoneThree retirement concerns the Vodafone 2G network.
Anyone responsible for old connected equipment should check it before 2029. The Government specifically warns that 2G-only phones and smart devices will need replacing or upgrading to maintain connectivity after the relevant network closes.
For a provider-specific example, see our guide to the EE 2G switch-off from May 2029.
Why 2G mattered
2G’s importance was much bigger than its data speed. GSM helped make digital mobile calling, SIM-based subscriber identity, text messaging and international roaming normal parts of consumer mobile service.
Later generations dramatically improved data performance, but many ideas established during the GSM era still shape modern mobile networks and customer expectations.
2G was the generation that moved mass-market mobile networks from analogue to digital. GSM launched commercially in 1991, SMS followed in 1992 and later GPRS/EDGE added basic data. In the UK, the technology is now entering its final years, with major network retirements planned from 2029.
2G FAQs
What is 2G?
2G means second-generation mobile network technology. It replaced first-generation analogue cellular systems with digital networks and enabled digital voice, SMS and later basic packet-data services.
When did 2G first launch?
Commercial GSM entered service in 1991. Radiolinja in Finland launched a commercial GSM service on 1 Jul 1991, when former Finnish prime minister Harri Holkeri made a public GSM call.
Is GSM the same as 2G?
Not exactly. 2G is the generation of mobile technology, while GSM is a specific digital cellular standards family within that generation. GSM became the dominant 2G system in the UK, Europe and many other markets.
When was the first SMS sent?
The first SMS was sent on 3 Dec 1992. Software engineer Neil Papworth sent “Merry Christmas” from a computer to Vodafone director Richard Jarvis.
What are GPRS and EDGE?
GPRS and EDGE are later data upgrades to the GSM family. GPRS added packet-switched mobile data and is often described as 2.5G, while EDGE increased data capacity and is sometimes described as 2.75G.
When will 2G be switched off in the UK?
Current plans are for EE to begin nationwide 2G retirement from May 2029, Virgin Media O2 to start switching off 2G in summer 2029 and VodafoneThree to switch off the Vodafone 2G network in spring 2030. UK operators have committed not to continue 2G beyond 2033.
Sources and further reading
- GSMA: Our history — GSM standards milestones and the first GSM call.
- Ericsson: Who was first? — commercial GSM activity and Radiolinja’s 1 July 1991 launch.
- Vodafone: 25 years since the world’s first text message — Neil Papworth’s 3 December 1992 SMS.
- UK Government: Telecommunications Modernisation Connectivity Timeline — current EE, Virgin Media O2 and VodafoneThree 2G retirement dates.
- UK Government: Preparing for the 2G switch-off — consumer and connected-device guidance.
- Ofcom: 2G and 3G switch-off — current UK consumer information and operator timetable.