didn't work where we used to live (in Surrey) or where I worked(in Surrey)... hence why I never bothered with a mobile phone previously (no network coverage on anything for both places and my commute in between). Both not that far from GuildfordI went to Tesco a couple of years ago having used nearly all of the main networks at one time or another. Excellent coverage and the only one that works in my bit of rural Surrey
When I was on Orange I could only get a signal by holding my phone up to a window, or by going out into the street. I am now on Giffgaff which uses the O2 network, and I get a good signal everywhere in my house, and in most places around the town. Some big buildings do seem to block the signal though - I couldn't get a signal yesterday in the new town hall building, or last week in a cafe in a converted mill building.