Which Is the Fastest Mobile Network in the UK for 2026?
EE, according to independent testing firm RootMetrics. Its H1 2026 study, based on more than 609,000 tests carried out between January and June, put EE top of every category tested, with Three UK moving into second place ahead of Vodafone.
The overall scores were EE on 95.6, Three UK on 89.5, Vodafone on 88.4 and O2 on 84.1, out of a possible 100. It is the latest in a run of RootMetrics reports where EE has come out on top, so if you are on EE already, this result will not surprise you.
The bigger shift in this round is Three UK overtaking Vodafone for second place, something that had not happened in previous RootMetrics rounds. Both operators have been investing heavily in network upgrades since the VodafoneThree merger completed, and this is the first result where that spending shows up clearly in the table rather than just in press releases.
How RootMetrics Tested the UK’s Mobile Networks
RootMetrics drives and walks set routes across the UK with test phones running automated checks, measuring things like download speed, call reliability and how often a connection drops. It is independent of the networks themselves, and the methodology has stayed broadly consistent for years, which is why the twice yearly results are treated as a reasonably fair yardstick.
For 5G specifically, EE also came out as one of the fastest mobile networks, with a median download speed of 230.8Mbps in the test areas, ahead of Vodafone on 174.4Mbps, Three UK on 158.9Mbps and O2 on 117.3Mbps.
Being the fastest mobile network on paper does not always translate into the smoothest everyday experience. RootMetrics also scores call reliability and text delivery, and the gaps between networks on those measures were much tighter than the headline speed numbers suggest, which is worth remembering if calls matter more to you than streaming speed.
Key takeaways
- EE topped every category in RootMetrics’ H1 2026 UK study, scoring 95.6 out of 100.
- Three UK moved into second place overall, ahead of Vodafone for the first time in this series.
- EE also led on 5G availability, at 80% of test locations, with O2 close behind at 78%.
- National averages do not guarantee good signal at your address. A local coverage check matters more than the overall table.
Does the Fastest Mobile Network Actually Matter for You?
Less than the headline suggests, for most people. RootMetrics tests average out performance across the whole country, but mobile signal is intensely local. A network that tops the national table can still be patchy in your specific postcode, and a lower ranked network can be excellent exactly where you live and work.
Before switching networks purely on the strength of a national ranking, it is worth checking coverage at your own address and the places you actually spend time, not just the country wide average. Our mobile coverage checker guide walks through how to do that properly before you commit to a new contract.
It is also worth remembering that EE, Vodafone, O2 and Three all sell capacity to MVNOs running on the same masts for less money. Topping a speed table does not automatically mean the best value deal, and we cover that trade off in our guide to cheap mobile networks that use the same masts.
What to Do If You’re Not on the Fastest Mobile Network
Nothing urgent, if your signal is currently fine. Chasing whichever network happens to be the fastest mobile network in the newest report is a good way to pay early exit fees for no real gain, especially since the rankings shift between reports as operators invest in different areas.
If your signal genuinely is patchy at home, a multi network SIM is worth a look before committing to a full switch. These use more than one network at once and automatically pick the strongest available signal, which can bridge the gap while you decide whether a full switch is worthwhile. Our guide to multi network SIMs explains how they work and where they make sense.
Doing nothing costs nothing if your signal already works for you. The RootMetrics table is a useful sense check, not an instruction to switch on the spot.
If you do decide to move, treat the fastest mobile network label as a starting point for research rather than the final answer. Check coverage at your address, compare a couple of MVNOs riding the same network, and only then decide whether the switch is worth the admin.
Frequently Asked Questions About the Fastest Mobile Network in the UK
- How often does RootMetrics publish its UK mobile network results?
- RootMetrics publishes results twice a year, typically covering January to June and July to December, so the fastest mobile network ranking can shift as networks invest in different areas.
- Does the fastest mobile network cost more?
- Not necessarily. EE, the fastest mobile network in the latest results, sells capacity to several cheaper MVNOs that run on the same masts, so strong performance and a lower monthly cost are not mutually exclusive.
- Can I check my own mobile signal before switching?
- Yes, most networks publish postcode level coverage checkers, and comparing two or three at your actual address is more useful than a national ranking alone.
- Is 5G availability the same as 5G speed?
- No. Availability measures how often a 5G signal is present during testing, while speed measures how fast that connection actually is once you are on it. A network can lead on one and trail on the other.
- What if my current network is not the fastest but works fine for me?
- Then there is little reason to switch on speed alone. A network ranking is only useful if your actual signal or speed is causing you a real problem.
- Do MVNOs get the same speeds as the network they run on?
- Broadly yes for coverage and raw speed, though some MVNOs deprioritise data at very busy times, so it is worth checking a provider’s own terms if peak time speed matters to you.
