People were really disappointed when they came to know about the fact that 4G provider Airtel uses TD-LTE 2300 MHz band which is not supported by the Nokia Lumia 920. So despite of having an LTE provider and Lumia 920 being an LTE device, they won’t be able to enjoy the LTE service.
However, while chatting with Nokia Care person, he revealed that Nokia will release a OTA update soon for Lumia 920 which will unlock the TD-LTE band in Lumia 920. We may not consider it as an official statement. I have real bad experience with Nokia priority dealer and their noobish talk. But still we can hope this to be true.
India has LTE connectivity in three cities, Banglore, Pune & Kolkata provided by AirTel. There are probably no mobile phones that supports TD-LTE. TD-LTE is very least used standard, mainly adopted in China. It requires buying an expensive USB device to use them currently. Support for TD-LTE from Lumia 920 will surely bring a boost in LTE users in India.