DND stands for Do Not Disturb. This is a Regulation by TRAI (Telecom Regulatory Authority of India) to immune Telecom users from gratuitous SMS/Calls. According to the recent TRAI (Telecom Regulatory Authority of India) guidelines, mobile numbers Registered with DND (Do Not Disturb), will not receive any unwanted advertising SMS and Calls from businesses. If they Receive Any Sort of such SMS/calls, they Can register complaints against the Sender To TRAI. Contact us to learn more About Activating and De-Activating DND.