Hello Shekhar
I’m a filipino but Ive been in India many times,however,as you know that I have not known any networks upgrading for UMTS since this is a 3G technology.As for Airtel,Hutch or BPL networks I guess they are still on the process of planning to upgrade it.
UMTS is a 3G tech that adapts EDGE technology to be incorporated on the network side…I hope this answers to your question.