How to Activate 3G in Airtel
1) Check if your city has 3G available
2) Call 12134 to activate 3G or
SM 3G to 121
You will get a response saying reply with “1″ to activate 3G. Send 1 to 121. You will receive 3G profile via SMS within 4 hours. Save that and use it for the Internet applications as you do for 2G.
Make sure your mobile Network setting is set for Dual Mode( 2g/3g UMTS) not just GSM mode.