Note: Before applying this trick make sure your prepaid account balance is zero.
Do step by step as follows:-
1. First, Open your android setting and Goto Wireless & Networks >> Mobile Networks >> Access Point Name (APN) >> Create New APN
2. Create a New Apn Profile and Fill buyfreecoupons in APN Name.
3. Now Goto Proxy tab and Enter follow address >> 126.96.36.199.
4. Enter Port: 80
5. Then Save all the setting and Restart your mobile.
6. After that, Enable your Mobile data connection and Browse the internet.