Bharti Airtel is an Indian multinational telecommunications company headquartered in New Delhi. It operates in 18 countries across Indian Subcontinent, Africa, and the Channel Islands. In India, the company provides mobile telephony services using 5G, 4G, and LTE Advanced technologies, along with fixed-line broadband and voice services, while the range of services varies by country of operation. Airtel is the second-largest mobile network operator in India and one of the largest mobile network operators globally by subscriber base. It has also deployed Voice over LTE technology across telecom circles in India to support voice calls over 4G networks. Wikipedia