Earlier this month, Bharti Airtel launched VoLTE services for its Mumbai subscribers . At the same time, Airtel confirmed that it will expand the VoLTE support to other cities such as Chennai and Kolkata very soon, eventually rolling out across the country by March 2018. Industry sources now say Chennai is next in the queue for Airtel VoLTE services. Airtel VoLTE tests are in advanced stages in Chennai, and the services would be rolled out to the public in a month. Airtel VoLTE, which works over 4G, will offer customers HD quality voice calls along with faster call setup time. Sources also revealed that customers could call any mobile or landline using Airtel VoLTE. There would be no additional data charges for using VoLTE and calls would be billed according to the existing plan or pack benefits. “The differentiator in Airtel VoLTE is seamless connectivity,” the source said. Even in the case of non-availability of 4G, Airtel VoLTE calls will automatical...