Best mobile network in SA3 Swansea postcode district

Comparing Ofcom-verified operator coverage footprints, EE delivers the strongest signal in Swansea. In this mixed urban-rural area, EE achieves an overall coverage score of 83/100 — driven by good 5G coverage (67%) and rock-solid 4G at 99%. 5G and 4G scores are closely matched, reflecting a mature, stable network.

EE clearly leads O2 by 7 points overall. While O2 reaches 55% on 5G and 97% on 4G in Swansea, it falls short of EE's combined performance across all bands. Three and Vodafone round out the field at 73 and 71 respectively.

EE has made solid 5G inroads across Swansea, reaching 67% of premises in SA3. While not blanket coverage, most streets and town centres are covered — and 4G fallback at 99% keeps reliability high throughout.

The runner-up in SA3 is O2 at 76/100 (55% 5G / 97% 4G). The margin is noticeable but not enormous. EE edges ahead on 5G depth; if your plan is with O2, 4G performance should still be solid.