If you don’t want telemarketing calls and SMS on your mobile. You need to register your mobile number in National Do Not Call Registry. It is an centralized place where you can block all unwanted calls and SMS but it will take 45 days to active. You can remove your mobile number any time from the NDNC.
Procedure to register your mobile number in National Do Not Call Registry.
Call 1909 or SMS to 1909 with keyword START DND.
If you want to De-register your mobile number, send sms to 1909 with keyword STOP DND.