I use tata docomo for 4 years and its good for me.Usually I get good signal from towers.
I use 3g and speed is awesome as 4G. I get near 5 to 6 mbps.
But afternoon like 2 to 4 I wnt get internet somtimes it turns to 2g itself but after sometime it come backs to 3g.
The plans are also good compared to other networks.The unlimited plans rare too good in tata docomo.
The ISD tarriff are also cheap than others . I was called ISD it was charging 2rs per min.I usually get signals all the time.
But the customer service r wrs they dnt respond properly.If we ask for duplicate sim they will tell change the network instead of giving a new sim.
I recommend to use this network.