I've been using airtel sim card from about more than 3 months.
All my experience with it shows me that it's network coverage are is awesome and signal strength is also strong. It even provides network where other companies can't like in rural areas and inside the building. But here's why I only used this sim card mostly for incoming call and not for outgoing.
The calling rates are very high. More than any other service providers. Also 3g and 4g plans are insanely costly for me. So if you are a network concious person who is willing to pay for good network coverage this is for you
