Best mobile network in CM5 Chelmsford postcode district

Drawing on Ofcom Connected Nations 2024 premises coverage statistics, EE scores highest across Chelmsford. In this mixed urban-rural area, EE achieves an overall coverage score of 83/100 — driven by good 5G coverage (69%) and rock-solid 4G at 98%. 5G and 4G scores are closely matched, reflecting a mature, stable network.

EE consistently leads Three by 7 points overall. While Three reaches 56% on 5G and 96% on 4G in Chelmsford, it falls short of EE's combined performance across all bands. O2 and Vodafone round out the field at 74 and 72 respectively.

EE has made solid 5G inroads across Chelmsford, reaching 69% of premises in CM5. While not blanket coverage, most streets and town centres are covered — and 4G fallback at 98% keeps reliability high throughout.

The runner-up in CM5 is Three at 76/100 (56% 5G / 96% 4G). The margin is noticeable but not enormous. EE edges ahead on 5G depth; if your plan is with Three, 4G performance should still be solid.