I started using Vodafone before five to six years. I am very happy with their services.
The network is very good. I almost got full range but My other sim(not want to mention.ok its DoCoMo) failed to get even 2 or 3 lines of bars.The Internet Is the main service everybody wanted from a mobile operator. and Vodafone is good in it.
Normal 2G service is better than some so-called 3G services. And what should I say about 3G.its excellent .As I have wifi in the house so didnt use it much. But I tried it some times. its awesome. and I really would say Vodafone customer care executives are helpful.