Do you want to avoid unwanted telemarketing calls and SMS, arriving on your Mobile or Landline phones from Telecom companies which aim to provide additional services, promotions, offers, plans, tariffs, etc?
National Do Not Call Registry (NDNC Registry) is a measure from Telecom Regulatory Authority of India, whose main objective is to control Unsolicited Commercial Communication (UCC) and let you get rid of it.

To Register in NDNC Registry – Call 1909 (toll free) or SMS START DND to 1909 (toll free). In case you want to de-register yourself from the NDNC registry SMS STOP DND to 1909 (toll free).
Alternatively, users can visit the ‘Do not Call/Disturb’ registration webpage of their desired telecom subscribers to apply for same.

Note: Promotional calls and messages to your Landline or mobile phone should stop within 45 days from the date of registration.