Airtel has promised customers to upgrade their sim cards to 4g and get free 4gb data. They also promise to give 1gb data for free everyday for 30days.
You don’t need to visit any airtel chop to upgrade your your sim cards any more, all you have to do is to buy a new sim card and visit click the link below to upgrade your sim.
Note Backup all your contacts before you start upgrading your sim card because immediately you upgrade the old sim card will be deactivated visit and follow the steps there to upgrade your sim card. If you encounter any problem, you can comment on this site or call the airtel customers care line.