To stop customers from eroding to Jio free network Airtel is giving away unlimited calls in Bangalore Karnataka where it is market leader. This offer is similar to the 299 Delhi offer with almost similar terms. Here the catch is that sms are not free and calls to landline are not included though not shown in screenshot below.
It’s a best offer plans so not permanent. Dial *121# or check in my-airtel app to check for your offers.
Airtel, Vodafone, Idea and even Aircel charges higher rates landline calls. Most stv are not valid on landline and even standard call rates are bit higher. This when termination charges to landline phone is zero. Call rates to landline are not mentioned in most vouchers. Another reason not to use the incumbent operators.