Im a tata docomo customer and its a really very nice network. Im using it from a long time but dont even have much problem. Yahh some time its nerwork get out of range and some placess its not present like delhi. Which is its most cone but never the less those placess like karnataka n other south reagon its done a grate job and its 3g network is awesome.
But me suggetion is if your company is doing a grate job in 3g then what will happen in 4g.
You should start your 4g services soon and im really a big fan of your network connections. I love it.