Mostly those people need these dongles when they are travelling or don’t have access to wifi. There are many dongles in the market and MTS is the worst of all. MTS initially promises to give high speed and more data but later they can’t provide any of these.
Even in big cities like delhi/bangalore the speed is not good enough, so imagine what will happen when you are travelling outside these cities. MTS does fake promises and does not deliver their word. I would say that go for other good companies rather than this one.