Hi friends I have a great Tricks for Airtel 3G User.
First activate Airtel 3G ( if you you use 2G SIM)
Then send SMS 3G to 121
You will receive a SMS that :-
3G service is already active on your number. to choose your plan
replay with 1.
1. Data Plan
2. Deactivate 3G
Choose 1 for DATA PLAN
then Choose 13 (it may change for different circle) for 4 GB free AIRTEL 3G DATA
You will get 4096 MB of DATA and Rs. 1.00 Main balance for free.
I have check this with 0 balance
Check 3G Data Balance by dialing:- *123*11#