Q1
Best network for SS7?
O2 leads with 100/100 — driven by 100% 5G and 100% 4G in this mixed urban-rural part of Southend.
SS7 DISTRICT · BASILDON
Best mobile network in Thundersley SS7 · Basildon
O2 scores 100/100 — the best measured network for SS7 in Southend, 10 points clear of the weakest. 100% 5G-grade · 100% 4G. Ofcom Mobile Coverage data (May 2025), measured across 89 addresses in 5 sampled postcodes.
The SS7 district covers Thundersley, Bowers Gifford, North Benfleet and Tarpots, in Basildon. Signal varies street by street — scan your exact postcode below.
RESULT · SS7 · SOUTHEND
Coverage for SS7 district
★ BEST MEASURED
O2
100/100
O2 has the strongest measured coverage for the SS7 district in Southend, 10 points clear of the weakest network in Ofcom's data.
Full ranking — SS7
#1
O2
#2
Vodafone
#3
Three
#4
EE
Coverage analysis — SS7
According to Ofcom's Mobile Coverage data, O2 leads the field in Southend. In this mixed urban-rural 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 consistently leads Vodafone by 0 points overall. While Vodafone reaches 100% on 5G and 100% on 4G in Southend, it falls short of O2's combined performance across all bands. Three and EE round out the field at 91 and 90 respectively.
Why O2 for SS7?
O2's 5G rollout in Southend is among the strongest nationally, covering 100% of premises in the SS7 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 SS7 is Vodafone at 100/100 (100% 5G / 100% 4G). It is a close contest — both operators deliver strong coverage in SS7, and your choice may come down to tariff, handset preference, or existing contract.
Switching to O2 in Thundersley
O2 has the strongest measured signal here — 100/100, with 100% 5G-grade and 100% 4G coverage across Thundersley, Bowers Gifford, North Benfleet and Tarpots, 10 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 Southend area
View full coverage analysis for the Southend (SS) area, or enter any UK postcode in the scanner above for a personalised result.
Coverage FAQ — SS7
Q2
Is 5G available in SS7?
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 mixed urban-rural areas.
Q4
Is Three worth considering?
Three scores 91/100 in SS7 (100% 5G, 100% 4G). It may suit certain tariff or price preferences despite trailing the top two.