The company said in a statement that, "Honouring its commitment to revert off-net domestic voice-call charges to zero, as soon as IUC charges are abolished, Jio will once again make all off-net domestic voice calls free, starting 1st January 2021." 

"Jio stands firm on its commitment to making the common Indian the beneficiary of advanced technologies like VoLTE. Jio is a customer-obsessed organization and cares for every single user. All our users enjoy free voice calls with Jio," it said. 

In September 2019, the Telecom Regulatory Authority of India (TRAI) extended the timeline for implementing the Bill and Keep regime beyond January 1, 2020.  

It will be worth to point out that Jio brought a six-paise per minute charge for domestic voice calls to other networks in October last year.