Three UK Delivered Fastest Mobile Broadband Speeds at Glastonbury | ISPreview UK

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Network testing firm Ookla (i.e. Speedtest.net, Downdetector.co.uk) has today revealed that mobile operator Three UK delivered the fastest 4G and 5G mobile broadband speeds during last weekend’s Glastonbury Festival, which saw the operator produce a median average download of 347.66Mbps. But O2 (Virgin Media) were the slowest on 67.66Mbps.

The median mobile download speeds on Three UK were found to be “at least twice as fast” as those on any other operator, and the network also topped Ookla’s Quality of Experience (QoE) measures – reflecting the typical performance for web browsing, video calling, and gaming throughout the event.

PICTURED: Mobile reception quality across the 2025 Glastonbury Festival site – all mobile operators combined.

However, despite Three UK delivering the fastest speeds, the study noted that festival-goers were still “least likely to experience poor performance” on EE’s network throughout Worthy Farm. At the 10th percentile, which captures the slowest 10% of outcomes when signal was weakest or congestion highest, EE still recorded the fastest download and upload speeds of any operator.

One critical thing to point out here is that all network operators will be working to deliver event specific coverage and capacity for major festivals like this. Ookla has thus included data to show the difference between festival vs pre-festival performance, which shows quite a diverse set of results.

Ookla-2025-Glastonbury-Festival-Download-Speeds-by-UK-Mobile-Operator

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