Yes, airtel and Vodafone are the major competitors in the mobile service game but reliance jio has shaken their grounds, because it is giving expensive services for free. there are the few things to note here. I stay in mumbai, one of the better cities in mumbai in terms of services, and im disappointed the most.
the network -to use free service ( mostly 4g) you need network, to call is the same too , there is no network, it shows jio 4g but never works, I put airplane mode on and off 100 times in a day for this. Calling has always been an issue, so for the peiple who think it is free, it isnfor a reason, understand