I have experienced stable connection problems with the 3 sim in Swindon and quite frankly poor indoor reception alongside my Vodfone sim which is much stronger. 3 updated the network on 22/1 but its made little difference. I also compared my Vodafone sim and Voda is much quicker online (3g) and more reliable around here. I was hoping to go back to 3 but its likely I will remain with Voda now.