Coming to the part of my review, I say that Aircel was more better than Tata Docomo in Karnataka, the reason is here.
I had used both Aircel and Tata Docomo, and believe me that Aircel’s signal was available in the hill stations(Up to 2 - 3 Signal bars) located nearby my hometown, where Tata Docomo wasn’t available in the same hill stations
{Aircel has been shut off it’s services recently}. I was faced a lot of connectivity issues with TATA Docomo, where I wasn’t able to get a single signal bar in the most of the rural areas where the incumbent mobile operator’s coverage exist, and also the Internet speed was even more pathetic than the others. It wasn’t a excellent operator in Karnataka telecom circle.