DND stands for Do Not Disturb,It let’s you block unwanted telemarketing calls and promotional messages,As per NCPR a mobile user can stop all the promotional calls and messages when ever you want as per your requirements,all the indan operators support this service,you can also activate different levels of DND for partial or full block.
The procedure for registering or withdrawing for DND is same for all the operators(Aircel, Airtel,BSNL,Tata DoCoMo,Idea Cellular,Loop Mobile,MTNL,Reliance Communications, MTS India, Tata Indicom, Uninor, Vodafone etc).To activate or stop just dial 1909 from your mobile.
How to view DND status online:-
To check the DND status for your mobile number goto this link dndcheck.in and input the mobile number ,you can also enter multiple mobile numbers Upto 5000,input the captcha and submit to get the status.
How to activate/deactivate DND:-
To activate DND just sms
START 0 to 1909
And to stop DND send
STOP to 1909
You will get the confirmation message for activation/deactivation after sending the sms.