I'm considering changing phones and provider for my mobile. One thing that I do find annoying about my present provider (T-Mobile) is the poor coverage on parts of the ECML. Apart from the inevitable drops in the tunnels, it's also VERY patchy just north of Stevanage and from St. Ives to Peterborough.
So, gentle readers with other companies: what are the other providers like? (particularly interested in O2).
theticketcollector_co_uk

Well FCC uses O2 for all its railway mobiles, and I think they used to use vodafone. My railway phone actually works in the tunnels just outside of Kings Cross and also works in some other tunnels belive it or not.
Though youll never get a signal on the Hertford Loop - ever.