Talking about Airtel it’s a great network they charge a heavy in postpaid and prepaid plans as well. So its sure that they charge heavy I mean they plan that too costly to purchase in well in postpaid and prepaid. However they provide a very good network strength and data speed at almost every places in India. They provide you very nice customer satisfaction. Exceptpt the costly thing. if you want to keep Airtel as your primary network then you can keep it but still your choice is your network and your phone.