EE, O2, Three and Vodafone all score 100/100 in SW20 — no network wins here on coverage. 100% 5G-grade · 100% 4G. Ofcom Mobile Coverage data (May 2025), measured across 145 addresses in 6 sampled postcodes.
The SW20 district covers Hillside, Dundonald, Cannon Hill and Coombe Hill, in Kingston upon Thames. Signal varies street by street — scan your exact postcode below.
Ofcom measures all four networks identically in the SW20 district, so coverage is not the thing to choose on here. Compare price and contract length instead.
No network wins South West London on coverage. All four score identically in Ofcom's measurements, across 145 addresses sampled in 6 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 South West London 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.
Every network reaches Hillside, Dundonald, Cannon Hill and Coombe Hill to the same standard in Ofcom's data, so coverage cannot pick one for you here — price and contract length can. Compare what each is charging, then check the exact street you live on before you commit, because indoor signal still varies where the area figures match.
Cheapest SIM on EE's network
1pMobile runs on EE's network, and its cheapest plan is £5 a month for 5GB — so the EE coverage measured above is the coverage you would actually get. This is a price option on EE, not a coverage ranking: Ofcom separates no network here, so no network leads this page — coverage will not decide it, price will.
See 1pMobile plans →Price read from 1pMobile's own website on 12 October 2026. Prices change often — confirm on their site before you order.
Need a new phone as well? Take the 60-second Phone Finder for three phones that suit you, with links to each one on EE.
Some links on this page are affiliate links. If you switch through one we may be paid a commission. It never changes which network we rank first - that comes from Ofcom coverage data alone.
View full coverage analysis for the South West London (SW) area, or enter any UK postcode in the scanner above for a personalised result.
No network wins SW20 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 SW20, so choose on price, contract length and roaming instead.
Ofcom's enhanced (5G-grade) outdoor signal reaches EE 100%, O2 100%, Three 100%, Vodafone 100% of the addresses sampled in SW20.
Good outdoor 4G: EE 100%, O2 100%, Three 100%, Vodafone 100%, as a share of the addresses Ofcom sampled in SW20.
Good indoor signal: EE 100%, O2 100%, Three 100%, Vodafone 100%. Indoor signal varies by building, so check your own address before you commit.
