After Mumbai, Madhya Pradesh and Chhattisgarh, Maharashtra & Goa, Gujarat, Andhra Pradesh and Telangana, Karnataka,Chennai and Coimbatore, Airtel has launched its 4G VoLTE services in Kolkata. This lets Airtel customers enjoy HD quality voice calls along with faster call set up time compared to normal voice calls on their VoLTE-compatible 4G handsets. Airtel promises seamless connectivity and in the case of non-availability of 4G, Airtel VoLTE calls will automatically fall back on 3G/2G network, said the company. It will also allow customers to continue with their data sessions at 4G speeds while the call is in progress. Airtel says that customers with Dual-SIM handsets should insert their Airtel SIM in SIM slot 1 and network mode should be set as "4G/3G/2G (Auto)" for VoLTE to work properly. The company says that the handset manufacturer need to upgrade the smartphone’s software to support Airtel VoLTE, even though there are hundreds of 4G smartphones in the market with VoLTE support. You can check out the complete list of Airtel VoLTE compatible smartphones here. Airtel already said that it plans to roll out VoLTE across the country over the next few months without any time frame. Commenting on the launch, Sameer Anjaria, CEO, West Bengal & Odisha, Bharti Airtel said: We are delighted to extend our VoLTE footprint to Kolkata with the launch of our services today. Complementing our world class ... 
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