I am using the tata docomo since four years
I found it very useful at some places means if you get its h+(3g) network then its speed is unbeatable in india it is very fast, its plans are affordable its calling rates are cheap than airtel, idea, vodafone and others
their services are good they are very concious for customers
but when you enters in yours house then it works like coming and going
in homes offices and other areas like closed areas this problem can come to you
other wise it is very good network
it is cheap