Im using vodafone network for past 5 years
Its a good network but in karnataka their is 3g throw airtel, and in andrapradesh their is 3g throw idea,
But in karnataka some times may decreases slow to only 1-5kbps but somtimes rises upto 6mbps and poor customer service. In AP their is only we can use 3g when we are in cities only not available in villages except KA all places their is no proper 3g
But overall good network coverage