-
@SubtleBlade @ijclark @O2 Ars Technica answered my technical questions: arstechnica.co.uk/business/2016/02/o2-customers-will-have-their-underground-journeys-tracked-analysed-by-advertisers/Permalink On Internet Archive
-
@SubtleBlade @ijclark @O2 As I suspected, it only works if you use Tube WiFi because O2's cellular signals don't reach underground.On Internet Archive