Important Note: Please make sure your mobile number is not DND registered number. Click Here to verify According to recent norms SMS vendors have put up a DND filter to all SMS sent through the gateway. So subscribers advised to de-register from DND. According to TRAI and as mentioned in the NDNC Registry, for customers who would like to register/de-register their request for NDNC registry may dial 1909 or SMS to 1909 with keywords 'START DND' for registration and 'STOP DND' for de-registration. It would take 45 days to process the request for register/de-register a MSISDN from the NDNC.