By default, 3G will be disabled by your network and we have to send an free SMS , to activate 3G for your new SIM card or existing 2G SIM card. Expand your mobile network in following List to see the Procedure to activate 3G by SMS or USSD code >AIRCEL In Aircel you need not have to replace the 2G SIM card.Just by sending an SMS your SIM card will be changed from 2G into 3G. Since Aircel announced unified data, now you can get 3G speeds in 2G Internet plans. Here is the procedure to convert your 2G Aircel SIM to 3G SIM card. Step 1 : Send an SMS START 3G to 121 Step 2: You will receive an SMS that your SIM is converted into 3G from Aircel network Step 3: Send SMS ALL to 121 Step 4 : You will receive configuration settings for 3G browsing. Save or Install it in your phone. Step 5: Now your mobile phone is capable of high speed 3G Browsing. Step 6: Subscribe for a suitable 3G Internet data plan for your budget. Then start browsing.