Airtel has just launched new Mobile plans in India, called myPlan Infinity they offer unlimited voice calling, STD and Roaming, however Data is fixed.
For Rs. 1199/- customers gets unlimited voice calling: local, STD, and on national roaming along with 100 SMS per day. 1GB 3G/4G data and free subscription to Wynk Music and Wynk Movies.
The Rs. 1599/- plan gets unlimited voice calling: local, STD, and on national roaming along with 100 SMS per day, 5GB 3G/4G data and free subscription to Wynk Music and Wynk Movies.  More plans detailed below. To activate a plan you can use the Airtel App or visit http://www.airtel.in/4g
Airtel Unlimited Voice Calling [...]
