I have the iphone 3gs on three network, and i can safely say that the coverage is piss poor, i dont think there has ever been a day in the 2 months or so i have owned it when i havent had the oh so familiar 'searching...searching...no service' message where my signal bar should be at least once, i went for a night out in a busy town centre a few weeks ago and had no signal for the entire 5 hours that i was out, it wasnt till i got home that i finally got all the accumulated texts and voicemails, and we had walked around practically the whole of town, and last weekend i went to wisbech, then to kings lynn banger racing for the day, then back to wisbech again, and at no point during that time, including travelling between lynn and wisbech could i get any signal at all, its terrible, the only main places i know i can get signal *most* of the time are at work at the pub or at home, even sat in my room now and i only have 1 out of 4 bars, and i dont think i have ever seen full singal, not ever, i literally dont like to have to rely on it, as anywhere else its a total signal lottery.