Tata docoma is not that old operator, infact came into action few years back. It came into attention because of it’s cheap data plans and call rates. But very few customers are happy with it, because of it’s network coverage. It looses signal a lot.
Very few towers are for this operator, they should focus on it, may be only this is way its cheap.
But for calling main think that is important ois the network, so its not at all satisfing. I do not recommend this operator to anyone.