How We Got Here: The Evolution of Telecoms
An interactive map of the telecom industry: how each network technology unlocked new capabilities and services, how the industry converged, and the BSS/OSS stacks each generation left behind.
Last updated 12 Oct 2026
Telecoms networks were not designed once. They were added to, generation by generation, over more than eighty years — copper voice, coax and microwave, satellite, fibre, cable, four generations of mobile, and now cloud-native and AI-driven networks. Each new technology unlocked new network capabilities, which made new services sellable — and each arrived with the systems needed to sell it, build it, bill it and fix it.
One entry is marked as a turning point: GSM, launched in 1991. It did more than make mobile digital. It gave the industry one global standard, the SIM, international roaming and SMS, and with them the subscriber records, provisioning, usage records and roaming settlement that mobile BSS/OSS still manage today. Select it on the map to see why.
Scroll sideways through time. Point at an entry for a preview; click it to light what it needed and what it led to. Click empty space, press Esc or choose All to see the whole map again. Time widens as history gets denser · ★ = turning point · c. = approximate · dashed = emerging / future · hatched = after today
Evolution of mobile standards
The map shows when each mobile generation arrived. Behind them is a short list of standards and the bodies that wrote them: GSM for 2G, UMTS for 3G, LTE for 4G and 5G NR with the 5G Core for 5G, specified first by ETSI and, since 1998, by 3GPP. The GSMA is a different kind of body: it represents operators, not the specifications.
From GSM to 5G: how global mobile technology standards evolved. Select a generation.
2G · GSM · Circuit-switched voice and SMS; GPRS later added packet data
GSM made mobile digital and standard across borders. Its first phase was specified by ETSI and launched in 1991; GPRS (c. 2000) and EDGE (c. 2003) were later additions for packet data.
Specification: Specified by CEPT’s GSM group, then ETSI (Phase 1, 1990); maintained by 3GPP from 2000
CEPT → ETSI
GSM’s original standardisation
3GPP
3rd Generation Partnership Project
GSMA
GSM Association
- CEPT → ETSI: GSM was designed under CEPT from 1982; ETSI (founded 1988) took it over in 1989 and handed it to 3GPP in 2000.
- 3GPP: Founded December 1998 for UMTS; took over GSM in 2000. Writes the technical specifications for every generation since.
- GSMA: Began as the GSM MoU group in 1987 and was formally registered as an association in 1995. The operators’ association: roaming, interoperability and implementation guidance. It does not write the 5G radio or core specifications.
- ETSIEuropean Telecommunications Standards Institute
- Standardised GSM, taking the work over from CEPT in 1989. Today one of 3GPP’s organisational partners.
- 3GPP3rd Generation Partnership Project
- A partnership of standards bodies, not a technology. It writes the specifications for GSM’s evolution, UMTS, LTE and 5G, in numbered releases.
- GSMAGSM Association
- Represents mobile operators and the wider ecosystem: roaming, interoperability and implementation guidance. Not the body that specifies 5G.
This follows the GSM/3GPP family. cdmaOne and CDMA2000 (specified by 3GPP2) were parallel 2G and 3G paths, mainly in North America and parts of Asia. ITU-R sets the IMT requirements for each generation (IMT-2000, IMT-Advanced, IMT-2020); 3GPP writes the detailed specifications that meet them. Years are first commercial launches, as representative milestones.
Why this matters for everything that follows
- Existing customers were provisioned outside modern models. A DSL line sold in 2004 has no product-catalog lineage: it lives in the stack that was current when it was sold.
- The frameworks came after the networks. TMN (1988), eTOM (2001), the TM Forum Open APIs (2016) and ODA (2018) describe how the systems should fit together — decades after many of them were built.
- Catalog-driven architecture is the answer to this history. One commercial catalog decomposing to whichever network delivers the service is how an operator stops adding a stack per technology — the subject of section 1.3.
- Switch-offs are transformations. Retiring the PSTN and copper (the UK’s by 31 January 2027) means migrating customers whose data was never modelled the modern way.
Key Takeaways
- Networks were layered generation by generation, and so were the BSS/OSS systems behind them.
- Most operators run several stacks at once because older generations were rarely retired.
- Modern frameworks and catalog-driven design exist to stop the next generation adding another silo.