Q1
Best network for RM4?
Three leads with 98/100 — driven by 100% 5G and 100% 4G in this densely populated urban part of Romford.
RM4 DISTRICT · BRENTWOOD
Best mobile network in Lambourne RM4 · Brentwood
Three scores 98/100 — the best measured network for RM4 in Romford, 6 points clear of the weakest. 100% 5G-grade · 100% 4G. Ofcom Mobile Coverage data (May 2025), measured across 143 addresses in 5 sampled postcodes.
The RM4 district covers Lambourne, Navestock, Theydon Bois and Theydon Mount, in Brentwood. Signal varies street by street — scan your exact postcode below.
RESULT · RM4 · ROMFORD
Coverage for RM4 district
★ BEST MEASURED
Three
98/100
Three has the strongest measured coverage for the RM4 district in Romford, 6 points clear of the weakest network in Ofcom's data.
Full ranking — RM4
#1
Three
#2
Vodafone
#3
EE
#4
O2
Coverage analysis — RM4
According to Ofcom's Mobile Coverage data, Three comes out on top for Romford. In this densely populated urban area, Three achieves an overall coverage score of 98/100 — driven by excellent 5G coverage (100%) and rock-solid 4G at 100%. 5G and 4G scores are closely matched, reflecting a mature, stable network.
Three consistently leads Vodafone by 1 points overall. While Vodafone reaches 100% on 5G and 100% on 4G in Romford, it falls short of Three's combined performance across all bands. EE and O2 round out the field at 92 and 92 respectively.
Why Three for RM4?
Three's 5G rollout in Romford is among the strongest nationally, covering 100% of premises in the RM4 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 RM4 is Vodafone at 97/100 (100% 5G / 100% 4G). It is a close contest — both operators deliver strong coverage in RM4, and your choice may come down to tariff, handset preference, or existing contract.
Switching to Three in Lambourne
Three has the strongest measured signal here — 98/100, with 100% 5G-grade and 100% 4G coverage across Lambourne, Navestock, Theydon Bois and Theydon Mount, 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 Romford area
View full coverage analysis for the Romford (RM) area, or enter any UK postcode in the scanner above for a personalised result.
Coverage FAQ — RM4
Q2
Is 5G available in RM4?
Three provides excellent 5G coverage at 100%. Vodafone follows at 100%.
Q3
Which network has the best 4G?
Three leads 4G too at 100%. Reliable 4G is critical in densely populated urban areas.
Q4
Is EE worth considering?
EE scores 92/100 in RM4 (100% 5G, 100% 4G). It may suit certain tariff or price preferences despite trailing the top two.