Q1
Best network for SA4?
Vodafone leads with 100/100 — driven by 100% 5G and 100% 4G in this mixed urban-rural part of Swansea.
SA4 DISTRICT · CARMARTHENSHIRE
Best mobile network in Llannon SA4 · Carmarthenshire
Vodafone scores 100/100 — the best measured network for SA4 in Swansea, 14 points clear of the weakest. 100% 5G-grade · 100% 4G. Ofcom Mobile Coverage data (May 2025), measured across 94 addresses in 6 sampled postcodes.
The SA4 district covers Llannon, Llwchwr, Tircoed and Gowerton, in Carmarthenshire. Signal varies street by street — scan your exact postcode below.
RESULT · SA4 · SWANSEA
Coverage for SA4 district
★ BEST MEASURED
Vodafone
100/100
Vodafone has the strongest measured coverage for the SA4 district in Swansea, 14 points clear of the weakest network in Ofcom's data.
Full ranking — SA4
#1
Vodafone
#2
O2
#3
Three
#4
EE
Coverage analysis — SA4
Drawing on Ofcom's sampled address-level coverage, Vodafone scores highest across Swansea. In this mixed urban-rural area, Vodafone achieves an overall coverage score of 100/100 — driven by excellent 5G coverage (100%) and rock-solid 4G at 100%. 5G and 4G scores are closely matched, reflecting a mature, stable network.
Vodafone noticeably leads O2 by 2 points overall. While O2 reaches 100% on 5G and 100% on 4G in Swansea, it falls short of Vodafone's combined performance across all bands. Three and EE round out the field at 88 and 86 respectively.
Why Vodafone for SA4?
Vodafone's 5G rollout in Swansea is among the strongest nationally, covering 100% of premises in the SA4 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 SA4 is O2 at 98/100 (100% 5G / 100% 4G). It is a close contest — both operators deliver strong coverage in SA4, and your choice may come down to tariff, handset preference, or existing contract.
Switching to Vodafone in Llannon
Vodafone has the strongest measured signal here — 100/100, with 100% 5G-grade and 100% 4G coverage across Llannon, Llwchwr, Tircoed and Gowerton, 14 points clear of the weakest. A cheaper plan on a network that does not reach your street costs more than it saves, so start from the coverage and pick the plan second.
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 Swansea area
View full coverage analysis for the Swansea (SA) area, or enter any UK postcode in the scanner above for a personalised result.
Coverage FAQ — SA4
Q2
Is 5G available in SA4?
Vodafone provides excellent 5G coverage at 100%. O2 follows at 100%.
Q3
Which network has the best 4G?
Vodafone leads 4G too at 100%. Reliable 4G is critical in mixed urban-rural areas.
Q4
Is Three worth considering?
Three scores 88/100 in SA4 (100% 5G, 100% 4G). It may suit certain tariff or price preferences despite trailing the top two.