I am using Airtel prepaid connection. One day suddenly I started receiving Jokes from them in free of cost.
After a while, I was charged Re.1 per day. My family members and friends are also receiving in the same way. When asking the customer care, reply is that, "Sample of jokes will be sent initially. You could have stopped by that time itself. We will deactivate this service within 24 hrs."
So if anyone receiving free information like jokes, astrology / anything from them without your notice, please deactivate it ASAP. Else, you will be enabled that service and charged without your information. If anyone have similar experience, please post them also.