Jio, the dream telecom and digital project by Mukesh Ambani was a pioneer in many things in Indian telecom, which I explained in earlier article. Most prominently Jio cut down the tariff drastically that none of the incumbents thought of. The unlimited data (per day 1.5 Gig of data, then FUP) and truly unlimited voice calls from Jio made the incumbents think differently and they were compelled to follow Jio's way of tariffs. However Jio stops unlimited calls w.e.f. 10th October 2019, onnet calls will be free and calls to other network will be charged at 10p/mi.
Back in 2008-09 Virgin Mobile was offering 10p/min of balance credited for incoming calls, yes they were getting paid from the call originating network at 20p/min as IUC (interconnect usage charge) and was generous enough to pay back to customers.
TRAI reduced IUC to 14p/mi in 2015, and then again IUC reduced to just 6p/mi from October 1st, 2017. TRAI wanted to make IUC zero from January, 2020.
