Tata Docomo — reactivation of a deactivated number

Address: 70/6, Deshbandhu Road, 3rd Floor, Flat No. - 5, Kolkata, West Bengal, 700035

Hi,

My name is poushali mukherjee. My mother rikta mukherjee had an old phone number from tata docomo, that is not being used for some months now. The number ([protected]) has been deactivated, as it was not used for a few months. When the sim is put into a phone, no network is being detected.

What is the steps i can to reactivate that number?

Thank you!