India's Telecom Regulatory Authority (TRAI) is intensifying its fight against telemarketing spam by calling on citizens to report unregistered telemarketers (UTMs) through the official Do Not Disturb (DND) app. UTMs use regular SIM cards to bypass regulatory safeguards, bombarding users with spam calls and messages despite being registered on the DND list.
What Are Unregistered Telemarketers (UTMs)?
Unregistered telemarketers (UTMs) operate by using standard SIM cards instead of the dedicated series assigned to registered telemarketers. This allows them to evade TRAI's monitoring systems and continue sending unsolicited communications. Unlike legitimate telemarketers who use 140 series numbers for voice calls and specific headers for SMS, UTMs exploit ordinary numbers to harass consumers.
TRAI's Initiative to Curb Spam
TRAI has mandated that citizens report spam numbers via the DND app to help authorities identify and disconnect UTM connections. This crowdsourced approach has proven effective, as evidenced by the disconnection of 1,84,482 UTM connections in 2025 alone. The app simplifies the reporting process, enabling users to copy and paste suspicious numbers for immediate action.
How to Report Spam Numbers
To report a spam call or message, users can open the DND app, copy the offending number, and paste it into the reporting interface. The app distinguishes between registered telemarketers (using 140 series numbers for calls and headers for SMS) and UTMs, ensuring accurate classification. Financial entities use 1600 series numbers for transactional alerts, which are legitimate and should not be reported.
Impact of Collective Reporting
The success of TRAI's initiative relies on widespread public participation. In 2025, the regulator disconnected over 184,000 UTM connections, demonstrating the power of collective action. Each report helps TRAI trace and dismantle illegal telemarketing networks, reducing harassment for millions of subscribers.
Regulatory Safeguards for Legitimate Telemarketing
Registered telemarketers operate under strict guidelines, using 140 series numbers for voice calls and specific headers for SMS. Financial institutions use 1600 series for transactional alerts. These measures ensure that legitimate communications are not disrupted while targeting illegal operators.
By leveraging the DND app, Indian citizens can actively contribute to curbing spam. TRAI urges everyone to report any suspicious numbers promptly, reinforcing the fight against telemarketing nuisance.
