HERE is a good offer for all airtel subscriber now get 500mb 3g free data

Steps:
1. most important is - Connect net though Airtel SIM only
2. Then Go here http://3gdongle.airtel.in/
4. fill your alternate Contact details and submit
5. Put the OTP , uhave recieved and press submit ​
6. now you will get 500MB free data on Airtel sim

Note: offer valid for airtel dongle users only

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Get Free 500 Mb 3g Data For Mobile With New Technique

1. First copy this link [Right click -> Copy] - https://www.airtel.in/myaccount/NavigationApp?num=MobileNumber

2. Secondly replace "MobileNumber" with your 10 digit Airtel mobile number.
3. Now open that link.
4. You will get an OTP code to your mobile.
5. Enter that and click "Submit".
6. Now a new page will open with this link - https://www.airtel.in/myaccount/NavigationApp/home.action
7. Now to get your MSISDN code see below screenshot -

8. Paste that MSISDN code to the new link given below
9. Now paste that code to this link - https://www.airtel.in/account/3gDongle/quickLink.jsp?msisdn=XXXXXXXXXXXXXXXX
10. Now open this link and you will get that offer. Click on the offer image.
11. Now enter alternate mobile number and email id.
12. Now you will receive a code to that alternate mobile number.
13. Enter that code and you will get your offer activated.

14. You will also get a confirmation message to your Airtel number.