Q1
Best network for CO6?
O2 leads with 99/100 — driven by 100% 5G and 100% 4G in this mixed urban-rural part of Colchester.
CO6 DISTRICT · BABERGH
Best mobile network in Marks Tey CO6 · Babergh
O2 scores 99/100 — the best measured network for CO6 in Colchester, 11 points clear of the weakest. 100% 5G-grade · 100% 4G. Ofcom Mobile Coverage data (May 2025), measured across 61 addresses in 5 sampled postcodes.
The CO6 district covers Marks Tey, Coggeshall, Greenstead Green and Birch, in Babergh. Signal varies street by street — scan your exact postcode below.
RESULT · CO6 · COLCHESTER
Coverage for CO6 district
★ BEST MEASURED
O2
99/100
O2 has the strongest measured coverage for the CO6 district in Colchester, 11 points clear of the weakest network in Ofcom's data.
Full ranking — CO6
#1
O2
#2
Three
#3
EE
#4
Vodafone
Coverage analysis — CO6
Based on Ofcom's measurements, O2 is the best choice for Colchester. In this mixed urban-rural area, O2 achieves an overall coverage score of 99/100 — 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 Three by 1 points overall. While Three reaches 100% on 5G and 100% on 4G in Colchester, it falls short of O2's combined performance across all bands. EE and Vodafone round out the field at 93 and 88 respectively.
Why O2 for CO6?
O2's 5G rollout in Colchester is among the strongest nationally, covering 100% of premises in the CO6 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 CO6 is Three at 98/100 (100% 5G / 100% 4G). It is a close contest — both operators deliver strong coverage in CO6, and your choice may come down to tariff, handset preference, or existing contract.
Switching to O2 in Marks Tey
O2 has the strongest measured signal here — 99/100, with 100% 5G-grade and 100% 4G coverage across Marks Tey, Coggeshall, Greenstead Green and Birch, 11 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 Colchester area
View full coverage analysis for the Colchester (CO) area, or enter any UK postcode in the scanner above for a personalised result.
Coverage FAQ — CO6
Q2
Is 5G available in CO6?
O2 provides excellent 5G coverage at 100%. Three follows at 100%.
Q3
Which network has the best 4G?
O2 leads 4G too at 100%. Reliable 4G is critical in mixed urban-rural areas.
Q4
Is EE worth considering?
EE scores 93/100 in CO6 (100% 5G, 100% 4G). It may suit certain tariff or price preferences despite trailing the top two.