Why UK networks switched off 3G
3G networks, first launched in the UK in 2003, were designed for a world of voice calls and basic mobile internet. Maintaining separate 3G infrastructure alongside 4G and 5G is expensive and spectrum-inefficient. By shutting down 3G, networks free up valuable spectrum — particularly the 2100 MHz band — and can refarm it for 4G LTE and 5G use, improving performance for the vast majority of customers who have been on 4G or 5G for years.
The UK followed similar switch-offs in Australia (2019), the US (2022) and across Europe from 2022 onwards.
UK 3G switch-off timeline
Who was affected?
The switch-off primarily affected two groups. First, users of very old handsets that lack 4G capability — typically smartphones bought before 2013 and basic feature phones. These devices can no longer connect to any mobile data network and will only function with Wi-Fi. Second, some IoT devices and older alarm systems that used 3G SIMs for connectivity required SIM or hardware replacement.
For anyone with a 4G-capable phone — which is effectively all smartphones sold in the UK since around 2014 — the impact on data was zero. Calls are a different matter, covered below.
The VoLTE issue for calls
In the 3G era, voice calls were made on the 3G or 2G network even if you were using 4G for data. VoLTE (Voice over LTE) allows voice calls to be made entirely over 4G, removing the need for 3G to exist at all. Most phones sold since 2017 support VoLTE. But some mid-range and budget phones from 2015–2019 support 4G data but not VoLTE — and those devices lost call capability when 3G was switched off unless they fall back to 2G (which some UK networks still maintain for legacy voice).
To check if your phone supports VoLTE: go to Settings → Network/Mobile → and look for a VoLTE or HD Voice toggle. Our guide to VoLTE and Wi-Fi calling covers this in more detail.
What happens to the freed-up spectrum?
All four networks have committed to refarming their 3G spectrum (primarily 2100 MHz band) for 4G and 5G use. This means more capacity and better rural reach as the spectrum is redeployed. The effect isn't instant — refarming requires equipment upgrades at each mast site — but the long-term result is a meaningfully better network for 4G and 5G customers.
Frequently asked questions
My signal got worse after the 3G switch-off — why?
If your phone is old enough to rely primarily on 3G for calls (pre-VoLTE handsets), losing 3G will degrade call quality even if data works fine on 4G. Check whether your phone supports VoLTE — if it doesn't, an upgrade is the most reliable fix.
Will the 3G switch-off affect my rural coverage?
Possibly in the short term. Networks have committed to refarming the 3G spectrum (primarily 2100 MHz) for 4G and 5G use, which should improve rural coverage over time. However, some areas previously served by 3G-only cells may have seen a temporary gap while the refarming was completed.
Do I need a new SIM?
No. SIM cards don't need replacing for the 3G switch-off. Your SIM will continue to work on 4G and 5G. Only your handset matters — it must support 4G VoLTE to make calls without 3G.