1.First of all airtel internet connection on airtel sim card and visit follow this link: http://3gdongle.airtel.in/
2.Now Search for Add Alternate Contact Details on this page and fill  it with your email id and mobile number details.
3.You will receive OTP (One Time Password) which you have to enter on current page. Just click Submit button to proceed further
4.Congratulations!! You will get 500 MB 3G internet instantly which will be valid for 7 days.
5.Offer is valid only once per sim card, but you can recharge unlimited new airtel numbers using this trick.
6. free airtel 500 mb 3G data free loot.
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