Comparing EE, Vodafone, O2 and Three across 5G · 4G · 3G for the Swindon (SN) postcode area. Use the scanner below to check your exact postcode.
O2 has the best measured signal in Swindon (SN), 8 points clear of the weakest network in Ofcom's data for this mixed urban-rural area.
Comparing Ofcom-measured operator coverage, O2 leads the field in Swindon. In this mixed urban-rural area, O2 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.
O2 noticeably leads EE by 1 points overall. While EE reaches 100% on 5G and 100% on 4G in Swindon, it falls short of O2's combined performance across all bands. Vodafone and Three round out the field at 99 and 92 respectively.
These scores for Swindon are Ofcom's own measurements, taken from the Ofcom Mobile Coverage API (May 2025 data) across 979 addresses in 54 postcodes. They describe outdoor signal at sampled addresses across the whole of Swindon; signal inside a specific building, and on a specific street, can differ from the area figure.
Across the SN postcode area O2 has the strongest measured signal — 100/100, 100% 5G-grade and 100% 4G in Ofcom's data. Coverage still varies street by street, so check your own postcode above before you commit to a contract.
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O2 has the best measured mobile coverage in Swindon, scoring 100/100 against Three's 92 — a gap of 8 points in Ofcom's data. O2 reaches 100% of sampled addresses with enhanced (5G-grade) outdoor signal and 100% with reliable 4G.
O2 reaches enhanced (5G-grade) outdoor signal at 100% of the addresses Ofcom sampled in Swindon.
EE is the second-best operator in Swindon with 99/100 overall (100% 5G, 100% 4G).
Swindon is classified as a mixed urban-rural area with a population density score of 62%. Mixed areas typically see good 4G and growing 5G from leading operators.
Check mobile coverage for specific postcode districts in Swindon:
Compare mobile coverage in nearby South of England areas:
