tata Teleservices (Tata Docomo) the Telecom unit is going to shut down as per sources, the officials are discussing ways to sell / surrender their spectrum holdings. In case you are using Tata Docomo services better port your number to other services.
The company was not doing well, for many years and now they want to close down and write off their losses. Most likely they will start the shutdown process soon probably in a month or two.