NEW DELHI: Indian telecom giant Bharti Airtel has expanded its Voice over LTE ( VoLTE ) coverage by launching the service in Andhara Pradesh and Telangana states. VoLTE techology allows customers to make HD voice calls at faster call setup time without any additional charges.With Airtel VoLTE, in case of non-availability of 4G network, calls will automatically fall back on 3G/2G network to ensure that customers continue to stay connected at all times.“Having built a world-class 4G network across the two geographies, we are delighted to roll out Airtel VoLTE for our customers. With the increasing penetration of VoLTE enabled smartphones in the market, Airtel customers can add to their calling experience to go with high speed data on India’s best smartphone network,” said Venkatesh Vijayraghavan, Chief Executive Officer, Andhra Pradesh & Telangana, Bharti Airtel.Airtel VoLTE will allow the customers to experience HD quality voice calls and high speed data sessions in parallel.