Q1
Best network for SG4?
O2 leads with 100/100 — driven by 100% 5G and 100% 4G in this suburban part of Stevenage.
SG4 DISTRICT · NORTH HERTFORDSHIRE
Best mobile network in Weston SG4 · North Hertfordshire
O2 scores 100/100 — the best measured network for SG4 in Stevenage, 11 points clear of the weakest. 100% 5G-grade · 100% 4G. Ofcom Mobile Coverage data (May 2025), measured across 53 addresses in 6 sampled postcodes.
The SG4 district covers Weston, Kimpton, Codicote and Knebworth, in North Hertfordshire. Signal varies street by street — scan your exact postcode below.
RESULT · SG4 · STEVENAGE
Coverage for SG4 district
★ BEST MEASURED
O2
100/100
O2 has the strongest measured coverage for the SG4 district in Stevenage, 11 points clear of the weakest network in Ofcom's data.
Full ranking — SG4
#1
O2
#2
Vodafone
#3
EE
#4
Three
Coverage analysis — SG4
Cross-referencing EE, Vodafone, O2 and Three in Ofcom's data, O2 delivers the strongest signal in Stevenage. In this suburban area, O2 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.
O2 comfortably leads Vodafone by 5 points overall. While Vodafone reaches 100% on 5G and 100% on 4G in Stevenage, it falls short of O2's combined performance across all bands. EE and Three round out the field at 94 and 89 respectively.
Why O2 for SG4?
O2's 5G rollout in Stevenage is among the strongest nationally, covering 100% of premises in the SG4 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 SG4 is Vodafone at 95/100 (100% 5G / 100% 4G). The margin is noticeable but not enormous. O2 edges ahead on 5G depth; if your plan is with Vodafone, 4G performance should still be solid.
Switching to O2 in Weston
O2 has the strongest measured signal here — 100/100, with 100% 5G-grade and 100% 4G coverage across Weston, Kimpton, Codicote and Knebworth, 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 Stevenage area
View full coverage analysis for the Stevenage (SG) area, or enter any UK postcode in the scanner above for a personalised result.
Coverage FAQ — SG4
Q2
Is 5G available in SG4?
O2 provides excellent 5G coverage at 100%. Vodafone follows at 100%.
Q3
Which network has the best 4G?
O2 leads 4G too at 100%. Reliable 4G is critical in suburban areas.
Q4
Is EE worth considering?
EE scores 94/100 in SG4 (100% 5G, 100% 4G). It may suit certain tariff or price preferences despite trailing the top two.