My O2 reception in ED is pretty bad; 3G coverage is intermittent, too. Mind you, I've found that O2 has heaps of black spots in London, whereas my girlfriend's Vodafone mobile always has coverage. Just for fun (!), if you have an O2 mobile, try using it in Shad Thames. No coverage. I worked in an office there, and we all got iPhones back when O2 was the only provider, and none of us could actually use them without a 5 minute walk! I'm not sure why I'm still with O2; it's been 8 years, maybe it's time for a change? I think I'm just lazy...