I am using vodafone from around 5-6 years and I can say that very few times I have faced a network problem. The network is good and the charges are higher. that is why it is like a good and bad operator. Everyone knows that vodafone has the widest range of network.
Their service is also good. I had money deducted but after I called the customer care, in 15 minutes I got my money refunded. I can say if anyone wants good network vodafone is good but if anyone wants less bills vodafone is not the first choice.