I personally use Airtel network since last 6 yrs. My whole family also only use Airtel. Airtel is very reliable . In any conditions I would only prefer to use airtel , in any terms airtel was always no.1 network . For voice calling , video calling , airtel was always no.1 . No lagging not at all. Best customer service , best networking service best network speed, best postpaid or prepaid plans. I’m sure that u already use airtel network and if you not so use it and feel the reliability.