Vodafone is haveg good network quality and amazing speed of internet and it work in all parts of indian.even at my viliage which is deep inside the forest vodafone 3g speed is amazing and help us to download faster even song movies and games and many other things I am just waiting for vodafone 4g to come and my whole family is waiting for it adn they all are using the sim of vodafone even the wifi is of vodafone at my home it gives very fast service and it is foreign brand they goves most amazing service and it also works in every party of the world
I suggest you to go with vodafone