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1 October 2020

Mobile phone coverage in London

New data from Which? and RootMetrics uncovers the reality of 4G coverage throughout the UK. Find out what it's really like in London and see which provider has the best 4G network.
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Hamse Yusuf

Even living in the capital city can mean that mobile experience can differ, depending on your mobile network. Our guide tells you all you need to know about which network has the best mobile signal experience.

Read on for the most recent network reliability and network speed scores for London, based on data from our partner, RootMetrics.

You can also use our mobile coverage map for a more granular analysis of where you live.

Best network for reliability in London

Unsurprisingly, London has the highest scores for network reliability across providers, with all four providers scoring over 97 out of 100.

EE is the best network for reliability, receiving a RootScore of 99, although the other three major networks (O2, Three and Vodafone) were not far behind.

Vodafone scored 98.1 with O2 and Three scoring 97.2.

Find out which network is the best where you live with our free coverage checker.

Best network for download speeds in London

Looking at the average speeds users in London experience, EE far outshines it competition with a score of 93.9. Vodafone was the only network to come close with a RootScore of 92.5.

O2 and Three really fall behind here, scoring 82.6 and 83.2 respectively.

It is clear that O2 and Three have a lot of work to do to rival EE for download speeds, with 5G round the corner.

Our analysis

The information used in this analysis comes from a regular collaboration between Which? and coverage experts RootMetrics, and is based on measurements taken from 1,994 miles of driving London roads and 97 locations.

Using these measurements, we're able to give a definitive account of the real mobile phone user experience using RootScores. A RootScore is a simple way to translate all the data gathered into clear and easy-to understand marks of performance and is scaled from 0-100. The higher the score, the better.

Read more about the approach, and download the free app, on the RootMetrics website.

Which network do you say is best?

Once you know which networks offer the best coverage where you live and work, you'll want to know which ones offer the best customer service and value for money. We asked 6,100 members of the public to tell us about what they love and hate about their network.

Read the results of our best mobile networks survey to find out the winners and the losers.