but
@Sarkar bro what about your place ? As you are part of West Bengal circle kindly share your area tower details of BSNL, Voda, Jio etc
Mobile Data :
At my home, Voda+Idea gives me full 4G tower even deep inside my home, Airtel 4G and Jio 4G is available only on top floor. No BSNL 3G even in top floor.
Along road in kolkata and in Nadia+North+south 24pargana+burdwan+Birbhum+Murshidabad dist according to my experience, You will get Airtel 3G/4G coverage in max places, after that Jio coverage comes to 2nd place. Voda+Idea 3G/4G coverage comes 3rd. You will not get BSNL 3G coverage most of the places.
So overall if you are within town you will get good Voda+Idea 3G/4G coverage but if you go towards countryside then Airtel and jio is best for data.
Call quality : BSNL is best and it has best 2G coverage also. you will find BSNL signal at remote bangladesh border also. Recently Vodafone is giving me a big headache in call quality.
Last of all Vodafone is the costliest of all. And they are very rigid to react any changes in pricing dynamics in market. Jio and AIrtel is the cheapest in my experience and they are fast to react any changes in pricing