1. Visit Tata DoCoMo's reload offer page using this link.
2. Now fill your mobile number as shown in the image below and click "Reload Now" button.
3. After successful submission of your mobile number, you get a congratulation message on the screen and your mobile number is rewarded with 100 MB free 3G data with a validity of 5 days.
Before using your data, please read terms and conditions by clicking here.