Q1
Best network for CF15?
EE leads with 100/100 — driven by 100% 5G and 100% 4G in this densely populated urban part of Cardiff.
CF15 DISTRICT · CAERPHILLY
Best mobile network in Radyr CF15 · Caerphilly
EE, O2, Three and Vodafone score between 99 and 100 out of 100 in CF15 — no network wins here on coverage. 100% 5G-grade · 100% 4G. Ofcom Mobile Coverage data (May 2025), measured across 70 addresses in 4 sampled postcodes.
The CF15 district covers Radyr, Pentyrch, Tongwynlais and Energlyn, in Caerphilly. Signal varies street by street — scan your exact postcode below.
RESULT · CF15 · CARDIFF
Coverage for CF15 district
✓ ALL FOUR MEASURE THE SAME
All four networks
100/100
Ofcom measures all four networks within 1 point in the CF15 district, so coverage is not the thing to choose on here. Compare price and contract length instead.
Full ranking — CF15
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EE
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Three
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Vodafone
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O2
Coverage analysis — CF15
No network wins Cardiff on coverage. All four are within 1 point of each other in Ofcom's measurements, across 70 addresses sampled in 4 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 Cardiff as a whole.
Ranked by Ofcom's overall score: EE 100, Three 100, Vodafone 100, O2 99. The spread between best and worst is 1 point, 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.
Why EE for CF15?
EE's 5G rollout in Cardiff is among the strongest nationally, covering 100% of premises in the CF15 district. For anyone streaming video, gaming on mobile, or relying on a mobile hotspot at home, this level of 5G penetration makes a real difference to day-to-day speed.
The runner-up in CF15 is Three at 100/100 (100% 5G / 100% 4G). It is a close contest — both operators deliver strong coverage in CF15, and your choice may come down to tariff, handset preference, or existing contract.
Choosing a network in Radyr
Every network reaches Radyr, Pentyrch, Tongwynlais and Energlyn to the same standard in Ofcom's data (within 1 point), 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.
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.
Explore the Cardiff area
View full coverage analysis for the Cardiff (CF) area, or enter any UK postcode in the scanner above for a personalised result.
Coverage FAQ — CF15
Q2
Is 5G available in CF15?
EE provides excellent 5G coverage at 100%. Three follows at 100%.
Q3
Which network has the best 4G?
EE leads 4G too at 100%. Reliable 4G is critical in densely populated urban areas.
Q4
Is Vodafone worth considering?
Vodafone scores 100/100 in CF15 (100% 5G, 100% 4G). It may suit certain tariff or price preferences despite trailing the top two.