What's amusing (for me) is the first I heard about this was via their Twitter account - I was on the internet at the time using their data network, having just turned my phone on!

Three seems fairly reliable, with a decent signal strength in my area, compared to O2/giffgaff (which my friends like to use).

Their support on Twitter is fairly quick to respond, but I suppose that's more indicative of the way support over social media is nowadays.