There are two categories of DND. i) Fully blocked – no commercial calls or sms would be allowedii) Partially blocked – no commercial calls however sms would be allowed for the categories one opts for TO REGISTER THROUGH SMS i) To opt for the fully blocked category, send SMS "START 0" to 1909 .ii) To opt for the partially blocked category, send SMS "Start "to 1909 as per the categories...
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