I am using Vodafone for last 3 years now. I left Airtel started using Vodafone. All I can say about Vodafone is that it has the best mobile phone operator among all. Wherever you are, you will always get a tower on your cell phone. The Internet facility is also the best. The customer service is very helpful and polite. Both the prepaid and postpaid service is good.
The only bad thing about Vodafone is that it is damn expensive. But the price is worth it. I am a proud customer and I recommend Vodafone to every one of you.