TRAI: 1600-series calls cannot be blocked, but 140-series subject to DND rules
India's telecom regulator TRAI has clarified that calls originating from the 1600 number series — used by regulated entities and government bodies — cannot be blocked by any application. These numbers are mandated by TRAI specifically for service and transaction calls made to existing customers. In contrast, the 140 number series is reserved for registered telemarketers making promotional calls. Consumers who wish to limit such promotional calls can register their preferences through the Do Not Disturb (DND) registry. This distinction ensures that critical service communications remain uninterrupted while giving users control over marketing calls.
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