CoverageMap

Harrow

Cell coverage comparison in Harrow, England

GB

Based on crowdsourced speed tests and signal measurements in Harrow, England using data from Greater London, the current snapshot reflects over 17,000 speed tests and shows medians of 52.4 Mbps download, 8.1 Mbps upload, and 27 ms latency.

Not enough data for Harrow

Showing performance data for Greater London instead. We need at least 25 speed tests in Harrow to generate local metrics.

Performance by Carrier in Greater London

Explore median download speeds, upload performance, and network latency for each major mobile carrier in Greater London, calculated from millions of real-world, crowdsourced speed tests. These results reflect typical everyday performance to help you compare carriers and choose the network that delivers the fastest speeds, most responsive connections, and broadest coverage where you live, work, and travel.

EE logo
Down51.4 Mbps
Up12.1 Mbps
Reliab.8.4 / 10

Over 4,400 tests conducted

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O2 logo
Down51.6 Mbps
Up4.9 Mbps
Reliab.7.6 / 10

Over 5,000 tests conducted

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Three logo
Down65.7 Mbps
Up9.7 Mbps
Reliab.5.8 / 10

Over 4,400 tests conducted

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Vodafone logo
Down44.1 Mbps
Up6.6 Mbps
Reliab.7.1 / 10

Over 3,300 tests conducted

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Performance by Carrier shows side-by-side results for the primary mobile providers measured in Greater London. Each row reflects download, upload, latency, and reliability for that carrier.

Providers included in this comparison are O2, Three, Vodafone, EE. Per-carrier test counts are shown in the table to indicate data accuracy.

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Network Performance in Greater London

Get a complete view of mobile network performance across Greater London with overall benchmarks and carrier-by-carrier breakdowns. Explore median performance metrics calculated from millions of real-world, crowdsourced speed tests. Start with the Greater London-wide snapshot to understand overall network trends, then dive deeper to compare individual carriers side-by-side and see how each performs in speed, responsiveness, and availability.

Median Performance

Download

52.4Mbps

Upload

8.1Mbps

Latency

27ms

Reliability

7.0/ 10

Top Performers

Best Download: Three

65.7 Mbps

Best Upload: EE

12.1 Mbps

Best Latency: Three

23 ms

Best Reliability: EE

8.4 / 10

Not enough tests

Network Performance aggregates all measured carriers in Greater London to provide a baseline view of typical speeds and latency in the area. Use these medians as a quick indicator of overall network quality.

Local testing in Harrow is limited, so these medians are based on data from Greater London. Current medians are 52.4 Mbps download, 8.1 Mbps upload, and 27 ms latency.

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Cell Coverage in Harrow: FAQ

What is the best cell phone carrier in Harrow?

Based on crowdsourced speed tests in Greater London, Three currently leads in median download speeds. Compare carriers in the performance table above for the latest results.

Why might this page show limited data for Harrow?

We need at least 25 recent speed tests to generate reliable local metrics. Until we reach that threshold in Harrow, we show performance data for Greater London when it is available.

What is the reliability score?

The reliability score summarizes how dependable mobile performance is in Greater London. It uses a 0.0 to 10.0 scale (higher is better) and is calculated from real-world speed test percentiles with weighted components: download (50%), latency (30%), and upload (20%). It evaluates the lower-end experience using the bottom 10%, 5%, and 1% percentiles when enough samples are available. If local speed testing is limited, a coverage-based fallback is used from signal quality distribution (great/good/poor).

How can I check coverage at my specific address in Harrow?

Use the interactive map to check signal strength at your exact address. Visit the CoverageMap interactive map to explore 4G/5G availability.

How can I contribute coverage data for Harrow?

Download the CoverageMap app and run a few speed tests with location enabled. Your results help improve coverage accuracy and unlock local rankings faster.

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Explore detailed coverage data for Harrow on our interactive map.

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