I'm using Tata Docomo as mobile operator for the past 5-6 years. It was good, in terms of network, recharge packs, internet speed.
But now a days they are providing very poor network coverage, I don't know how, but seriously my friends call me, they can't reach me through call, then they message me on whatsapp that "Tera phone nahi lag raha ".
Apart from network, they don't have good plans now, with the entrance of jio, and jio effect, there plans are look like on a higher side.
There was also talks in the market that thus company will shut down very soon, though company didn't say anything about this.
I will not recommend this mobile operator to anyone. Jio, airtel, idea has good plans and yes of course with good network coverage.