How to get Airtel Prepaid itemised monthly bill

In India generally we will get itemised bill for postpaid connections and not for prepaid bills.
Incase if you need prepaid bills for a particular month, airtel will send prepaid bill to your email address when you request them. You will be charged Rs.50/- for this service. charging is done through deducting in your prepaid account balance. ( This charge is when i am writing this article  Feb 2011).

send sms with below contents to the number 121

EPREBILL month_name  mail_id

Ex -
EPREBILL July user@mail.com