Buy any new Airtel sim for Rs 5/10 in the street and do Rs 14 Gprs recharge.
Activate 3G and you will get 3G speeds for 3 to 4 hours before they catch up with you.
Eiether they debit main balance and make it zero or speed capped at 40 kbps ( happens if you have a 1 GB/15 days gprs pack)
You can do this as many times as you want. The papers from the street dealer takes 2-3 days to reach airtel office where they input the details.
If you want 500-700 mb at 3 G speeds @ rs 20 ..go for it whenever you want.
Do this experiment again with a new sim and report results.
