SpeedGeo Study Names Fastest UK Mobile and Broadband ISPs in 2025 | ISPreview UK

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The relatively new SpeedGeo project, which stems from a Polish team that compares internet quality based on the broadband speeds of real users, has today published their 2025 results for the United Kingdom. The outcome named Virgin Media as the fastest fixed broadband ISP, while Three UK came top for mobile broadband (4G, 5G etc.).

The study is based on data gathered from real measurements conducted by users of their V-SPEED applications, including via their website, as well as on Android, iOS, Windows and macOS. A total of 109,136 tests were conducted across mobile connections using smartphones or tablets during 2025 (4G, 5G etc.), which increased to 842,397 for their fixed broadband (inc. WiFi connections).

As with the above note, there are always caveats to consider with speedtest based studies like this, not least because the results for fixed lines tend to be more reflective of take-up than network availability. For example, some fixed ISPs may have a much larger proportion of customers on slower copper-based lines (ADSL or FTTC), which can weigh against those on faster FTTP services with the same provider (i.e. pulling the average down).

Otherwise, the operators in both fixed and mobile categories were all ranked based on average download speed (from highest to lowest), although we do also get the figures for upload speeds and network latency (milliseconds), which are nice to have. Sadly, the main fixed broadband results appear to only focus on major national ISPs and has thus ignored many of the faster but smaller players.

Fastest UK Fixed Broadband Providers for 2025

Fastest UK Mobile Broadband Operators for 2025

Finally, SpeedGeo has also provided some data on the fastest fixed broadband providers in London, although this does appear to include Three UK into the list (probably due to their 4G/5G based Home Broadband package). But unlike the other tables this one does at least list some smaller networks.

London’s Fastest Fixed Broadband Providers for 2025