TRAI Blocks 27 Crore Daily Spam Calls in May After Disconnecting 21 Lakh Numbers

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Data presented to the Rajya Sabha indicates that India’s DLT-based anti-spam system intercepted more than 27.7 crore unsolicited calls and messages daily in May 2026.

DLT System Overview

The written response from the Minister of State for Telecom, Pemmasani Chandra Sekhar, highlighted the regulator’s ongoing efforts to combat unsolicited commercial communication. The DLT platform, central to the anti-spam initiative, operates under the Telecom Commercial Communications Customer Preference Regulations.

Registration and Compliance

Entities seeking to send promotional content must register with the system, which mandates telecom operators to use 140-series numbers exclusively for such communications. Over 24.53 crore consumers have opted into the system, which blocks unauthorized calls and messages.

Challenges and Limitations

The number of disconnected telecom connections reached 21.6 lakh during the period. Consumer complaints filed with telecom providers and forwarded to the Telecom Regulatory Authority of India (TRAI) totaled 31.09 lakh in 2025, with an additional 17.2 lakh reported in the first five months of 2026.

Spam Volume and Enforcement

This discrepancy between enforcement outcomes and complaint volumes reflects the growing complexity of spam generation. Despite the DLT infrastructure’s expansion, the demand for unsolicited communications continues to rise, challenging regulatory effectiveness.

AI and Machine Learning Integration

Major telecom providers have deployed artificial intelligence and machine learning tools to detect patterns associated with spam, even when calls originate from unregistered numbers. However, these tools face challenges in identifying sophisticated fraud schemes.

Unregistered Sources and Sophisticated Fraud

The DLT system’s limitations are evident in its inability to fully address spam originating from unregistered sources. A significant portion of unsolicited calls and messages bypass the platform, necessitating supplementary measures.

Financial Crime Concerns

The intersection of spam calls and financial crime remains a critical concern. Cybercriminals exploit unsolicited communications to execute digital arrest scams, fraudulent investment offers, banking update schemes, and one-time password (OTP) phishing attacks.

Complex Detection Challenges

The use of virtual numbers, internet-based calling services, and multi-state call routing further complicates detection efforts. Regulatory authorities emphasize that sharing personal information, OTPs, or banking details during unsolicited calls is a high-risk practice.

TRAI’s Advice and Reporting Mechanisms

TRAI has advised consumers to report spam calls and messages through the TRAI DND app, telecom operators’ complaint portals, and the Department of Telecommunications’ Sanchar Saathi platform. Suspicious communications linked to financial fraud should be reported to the national cybercrime helpline at 1930.

Industry Expert Insights

Industry experts highlight that timely and collective consumer reporting remains the most effective mechanism for regulators to counter evolving spam tactics. The dynamic nature of fraudulent methods requires continuous adaptation of technical controls and public awareness initiatives.