Best mobile network in SL9 Slough postcode district

Cross-referencing EE, Vodafone, O2 and Three using Ofcom 2024 data, EE leads the field in Slough. In this densely populated urban area, EE achieves an overall coverage score of 92/100 — driven by excellent 5G coverage (85%) and rock-solid 4G at 100%. 5G and 4G scores are closely matched, reflecting a mature, stable network.

EE comfortably leads Three by 5 points overall. While Three reaches 76% on 5G and 99% on 4G in Slough, it falls short of EE's combined performance across all bands. O2 and Vodafone round out the field at 86 and 85 respectively.

EE's 5G rollout in Slough is among the strongest nationally, covering 85% of premises in the SL9 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 SL9 is Three at 87/100 (76% 5G / 99% 4G). The margin is noticeable but not enormous. EE edges ahead on 5G depth; if your plan is with Three, 4G performance should still be solid.