Never opt for airtel mobile services weather its prepaid or post paid.If u go for prepaid they will activate unwanted paid services in your mobile without your consent. You will not even know that every day they are deducting your balance for the services you have never opted for. Their customer care is also use less, full of uneducated and impolite peoples.
Just quit airtel completely. This companys main aim is to extract maximum money from peoples as soon as possible as if world is going to end in few months. If u go for post paid they will send u inflated bills and u cannot keep track of all the calls u made from your mobile. Airtel is synonymous with looters.