Q1
Best network for CM3?
EE leads with 82/100 — driven by 67% 5G and 98% 4G in this mixed urban-rural part of Chelmsford.
CM3 DISTRICT · CHELMSFORD
Best mobile network in CM3 Chelmsford postcode district
Comparing EE, Vodafone, O2 and Three across 5G · 4G · 3G for the CM3 postcode district in Chelmsford.
RESULT · CM3 · CHELMSFORD
Coverage for CM3 district
★ BEST OPERATOR
EE
82/100
EE delivers the strongest coverage for the CM3 district in Chelmsford. Scored across 5G, 4G and 3G using the latest UK operator footprint data.
Full ranking — CM3
#1
EE
#2
O2
#3
Three
#4
Vodafone
Coverage analysis — CM3
Cross-referencing EE, Vodafone, O2 and Three using Ofcom 2024 data, EE scores highest across Chelmsford. In this mixed urban-rural area, EE achieves an overall coverage score of 82/100 — driven by good 5G coverage (67%) and rock-solid 4G at 98%. 5G and 4G scores are closely matched, reflecting a mature, stable network.
EE clearly leads O2 by 6 points overall. While O2 reaches 53% on 5G and 99% on 4G in Chelmsford, it falls short of EE's combined performance across all bands. Three and Vodafone round out the field at 75 and 70 respectively.
Best phone deals from EE
Once you've found the best network for your area, here are the top EE contracts available now.
Explore the Chelmsford area
View full coverage analysis for the Chelmsford (CM) area, or enter any UK postcode in the scanner above for a personalised result.
Coverage FAQ — CM3
Q2
Is 5G available in CM3?
EE provides good 5G coverage at 67%. O2 follows at 53%.
Q3
Which network has the best 4G?
EE leads 4G too at 98%. Reliable 4G is critical in mixed urban-rural areas.
Q4
Is Three worth considering?
Three scores 75/100 in CM3 (53% 5G, 98% 4G). It may suit certain tariff or price preferences despite trailing the top two.