Be careful if you are going for Airtel Myplan postpaid connection.
Airtel charged Rs 300 for one time activation fee, which I think very high . On top of that airtel charged service tax on that, which is 12%, so you are paying 336 one time activation fee instead of 300.
If you go for myplan, whatever usage you cross in mypack, airtel charged 12% tax on that.
Billing is on pulse basis, not second basis .
Mypack is on local mobile / STD mobile . if you called on landline, you will have to pay.
Overall, I think postpaid is much more expensive as compared to prepaid, so think twice if you are thinking to buy postpaid plan.
Rahul