Had nothing to do with three till a couple of months ago , had no issues at all just bought a pay and go sim from tesco 99 p stuck it in an unlocked phone and useing it at a tenth of the price of O2 , don't really see how you can go wrong, put a tenner on it and if it fails what have you lost £11 and probably saved that in free internetCouldn't agree more. Some of their sales tactics are despicable. I might have put it down to a rouge salesman, had it not been for their refusal to take sensible steps to resolve the issues.
It's a shame, because the network itself is fine.