Comparing EE, Vodafone, O2 and Three across 5G · 4G · 3G for the Harrow (HA) postcode area. Use the scanner below to check your exact postcode.
Ofcom measures EE, O2, Three and Vodafone identically in Harrow (HA), so no network wins here on coverage. Pick on price — then check your own postcode, because indoor signal still varies street by street.
No network wins Harrow on coverage. All four score identically in Ofcom's measurements, across 1,062 addresses sampled in 48 postcodes. On a difference that small, EE, O2, Three and Vodafone will all work here — so choose on price, contract length and roaming, not on a coverage map. Coverage only becomes the deciding factor once you leave built-up areas, and it still varies street by street indoors: check your own postcode below to see the measurement for your address rather than for Harrow as a whole.
Ranked by Ofcom's overall score: EE 100, O2 100, Three 100, Vodafone 100. The spread between best and worst is 0 points, which is inside the margin where a coverage figure stops being a useful tiebreak. Ofcom's data describes outdoor signal across sampled addresses; it cannot tell you how any of them behave inside your own building.
These scores for Harrow are Ofcom's own measurements, taken from the Ofcom Mobile Coverage API (May 2025 data) across 1,062 addresses in 48 postcodes. They describe outdoor signal at sampled addresses across the whole of Harrow; signal inside a specific building, and on a specific street, can differ from the area figure.
Every network clears the bar in the HA postcode area, so the honest advice is to stop comparing coverage maps and start comparing prices — the difference between the cheapest and dearest plan will dwarf a 0-point coverage gap. Check your own postcode above first: indoor signal varies street by street even where the area figures match.
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No network wins Harrow on coverage. Ofcom's measurements rate EE, O2, Three and Vodafone identically here (EE 100, O2 100, Three 100, Vodafone 100 out of 100), which is too close to call a winner. All four will work in Harrow, so choose on price, contract length and roaming instead.
EE reaches enhanced (5G-grade) outdoor signal at 100% of the addresses Ofcom sampled in Harrow, and the other three are within 0 points of it.
O2 is the second-best operator in Harrow with 100/100 overall (100% 5G, 100% 4G).
Harrow is classified as a densely populated urban area with a population density score of 82%. Urban areas benefit from high tower density across all bands.
Check mobile coverage for specific postcode districts in Harrow:
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