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DND stands for Do Not Disturb mode. If you do not wish to receive promotional calls and SMS then you can register your number and activate DND in it. It will save you from all the annoying calls and SMS. This was an initiative by TRAI (Telecom Regulatory Authority of India) to protect consumers from all the unsolicited calls and SMS.https://www.fast2sms.com/help/wp-content/uploads/2018/04/dnd.png