2G & 3G Shutdown by 2028: Is Your VoLTE Roaming Testing Ready?
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3G shutdowns are already well advanced in many markets. Even as networks moved through 3G, 4G and now 5G, legacy technology stayed in the background as a fallback for voice, messaging and roaming. That safety net is now disappearing.
Major operators have already set concrete 2028 deadlines. A1 has confirmed its 2G network in Austria will be switched off on 31 May 2028. Deutsche Telekom has announced its own German shutdown for 30 June 2028, and Telefónica Deutschland (O2) has confirmed it will phase out 2G in the second half of 2028. This isn’t one operator’s decision — it’s a coordinated industry shift to reclaim spectrum for 4G and 5G.
That raises a real question for every operator with roaming customers: when 2G is gone, are you sure your customers’ services will still work?
4G and 5G Coverage Isn't the Same as a Working Service
Seeing “4G” or “5G” on a smartphone can create a false sense of security. Network access alone doesn’t guarantee service availability — a subscriber can successfully attach to LTE while still having problems with voice, messaging or data.
Voice is the clearest example. Without legacy circuit-switched networks, voice increasingly depends on VoLTE — and eventually VoNR — working correctly end to end. That means the device must support it, the subscription must be provisioned correctly, IMS registration must succeed, and the roaming agreement and network interoperability must all be in place. If one link in that chain fails, a customer can have full LTE coverage and still be unable to make a call.
Roaming Turns This Into a Moving Target
Domestic networks are one thing — operators control the environment. Roaming is different, because it depends on multiple networks, devices, subscriptions and commercial agreements all working together, and none of them are being retired on the same timeline. One country may have already switched off 2G and 3G; another may keep 2G running for years; even operators inside the same market can be years apart.
That means a roaming subscriber can land in a completely different technology environment than the one at home. And because the legacy fallback is disappearing, problems that used to go quietly unnoticed become visible customer failures instead — for example:
- Registration succeeds, but voice doesn’t work
- VoLTE roaming is unavailable or misconfigured
- SMS behaves differently after a legacy network retires
- SIM or eSIM profiles behave inconsistently across visited networks
- Roaming agreements don’t cover the required technology
- Long registration or call-setup times
From a network dashboard, most of this still looks healthy. From the customer’s phone, the service simply doesn’t work — and network KPIs alone won’t catch it, because they measure network availability, not what actually happens on a real device.
This Is Why Real Devices Matter More Now, Not Less
As the legacy fallback disappears, real-device testing becomes the only reliable way to know what a subscriber actually experiences, rather than assuming it from configuration and KPIs. With SEGRON’s Global Service Enabler (GSE), operators can test and continuously monitor voice, data, messaging and roaming using real smartphones and real SIM/eSIM profiles — across domestic and roaming networks, on an ongoing basis, since roaming environments keep changing even after the shutdown itself.
2G will disappear. Customer expectations won’t. Before switching off the safety net, it’s worth verifying what happens without it.
Frequently asked questions
When are 2G and 3G networks being switched off in Europe?
Dates vary by operator, but 2028 is a common target. A1 (Austria) has confirmed 31 May 2028, Deutsche Telekom (Germany) has confirmed 30 June 2028, and Telefónica Deutschland/O2 has confirmed the second half of 2028.
Does 4G or 5G coverage guarantee my roaming service will work?
No. Network attach only confirms radio access. Voice, messaging and data each depend on separate steps — provisioning, IMS registration, roaming agreements, and network interoperability — any of which can fail independently of coverage.
What is VoLTE roaming testing?
It’s verifying that voice-over-LTE calls actually work when a subscriber is on a visited network abroad — registration, call setup, audio quality, and call continuity — rather than assuming it works because the device shows LTE.
How can operators verify service quality after a 2G/3G shutdown?
By testing with real smartphones and real SIM/eSIM profiles on the actual visited networks, continuously rather than as a one-time check. SEGRON’s GSE does this across domestic and roaming environments.
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Michael Sedlacek
Michael has a long history in the telecoms industry and served many international projects as
Senior Network Engineering Expert and Integration Consultant, which gave him profound insights
and experience in mobile technology and its requirements before starting up SEGRON Test Automation Solutions.
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