The worst network I have experienced till now is Vodafone in India. The customer service people are refusing to register the complaints and no resolving the problem of network issue. By mistake, I have ported out from Idea to Vodafone. Customer service people are misbehaving with customers which I have never experienced. Nobody cares about the network problem. Idea is having same problem and Vodafone too is having the same problem. The other surprising thing is Vodafone tied up with Idea. A very bad idea.