It has very bad connectivity in the world of network.tata docomo does not launched 4 g data which is the worst thing .and signal connectivity is very poor in ground floor and something good in upper floor.but 3g data speed is the fastest in the india and tatk time is cheap . but it does not give good speed in 2 g data and sim is also so costly than other. but iss offers and rate cutter is so cheap I think cheapest in all indian sim so I choose this sim . And it does not grow signal in forest amd some villages like airtel, idea, and vodaphome si! .