In 2014, I switched from cellone to vodafone due to poor network coverage and consistent call drops in cellone network. And since then I have got a sigh of relief. I no longer have to run on the terrace of the house to get network which I used to do with cellone. There are no call drops. The 2g speed is good too. But one thing which I greatly dislike is that they don't provide 3g coverage in my town. Mine is a well known town on the national highway and it really annoys me since india is now going 4g but vodafone can't even provide 3g. I think if you want to go for this network, then you should first check the 3g network availability in your area.
