converting the 2g sim into 3g of airtel

would you like to use 3g on your handset or in your pc. Then you can simply convert it by sending the sms. But this message is only work for airtel 2g sim. you can dos this by sending a sms "3g" on 121. and your sim will converted into the 3g, and you can use the 3g services.
But 3g rates are different from 2g. here are the plans, which comes in 3g airtel-
in the prepaid, you'll get 10 mb in rs.9 and in rs.97 you will get 200 mb, the biggest plan is rs.1245, in which you'll get 10 gb.
if you have 3g handset, then you can use it on your mobile or if you have datacard like huawei, then you can install mobile partner in your computer or laptop, then you can use it. you will need to change your network setting of mobile partner from "gsm only" to "WCDMA only" to use 3g network.