Q1
Best network for CM3?
EE leads with 100/100 — driven by 100% 5G and 100% 4G in this mixed urban-rural part of Chelmsford.
CM3 DISTRICT · BRAINTREE
Best mobile network in Hanningfield CM3 · Braintree
EE scores 100/100 — the best measured network for CM3 in Chelmsford, 6 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 CM3 district covers Hanningfield, Sandon, Boreham and Felsted, in Braintree. Signal varies street by street — scan your exact postcode below.
RESULT · CM3 · CHELMSFORD
Coverage for CM3 district
★ BEST MEASURED
EE
100/100
EE has the strongest measured coverage for the CM3 district in Chelmsford, 6 points clear of the weakest network in Ofcom's data.
Full ranking — CM3
#1
EE
#2
Three
#3
O2
#4
Vodafone
Coverage analysis — CM3
Cross-referencing EE, Vodafone, O2 and Three in Ofcom's data, EE scores highest across Chelmsford. In this mixed urban-rural area, EE 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.
EE clearly leads Three by 0 points overall. While Three reaches 100% on 5G and 100% on 4G in Chelmsford, it falls short of EE's combined performance across all bands. O2 and Vodafone round out the field at 99 and 94 respectively.
Why EE for CM3?
EE's 5G rollout in Chelmsford is among the strongest nationally, covering 100% of premises in the CM3 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 CM3 is Three at 100/100 (100% 5G / 100% 4G). It is a close contest — both operators deliver strong coverage in CM3, and your choice may come down to tariff, handset preference, or existing contract.
Switching to EE in Hanningfield
EE has the strongest measured signal here — 100/100, with 100% 5G-grade and 100% 4G coverage across Hanningfield, Sandon, Boreham and Felsted, 6 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 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 excellent 5G coverage at 100%. Three follows at 100%.
Q3
Which network has the best 4G?
EE leads 4G too at 100%. Reliable 4G is critical in mixed urban-rural areas.
Q4
Is O2 worth considering?
O2 scores 99/100 in CM3 (100% 5G, 100% 4G). It may suit certain tariff or price preferences despite trailing the top two.