Spam Calls and Messages in India: TRAI’s UCC Framework

India’s Do Not Disturb registry has existed since 2007. By mid-2026, still only about 1 in 6 mobile subscribers had actually registered on it. TRAI‘s real defence against spam now runs through something else entirely: dedicated number series, and AI.

📑 Contents

1Timeline
2Must Know
3Good to Know
4Test Yourself
5Great to Know

Timeline

2007: TRAI sets up the National Do Not Call (NDNC) Registry, India’s first attempt at this.
27 September 2011: The NDNC is replaced by the National Customer Preference Register (NCPR), today’s DND registry.
19 July 2018: TCCCPR 2018 replaces the older 2010 framework. It adds a blockchain-based Distributed Ledger Technology (DLT) backbone.
12 February 2025: A major amendment tightens telemarketer rules, and widens the complaint window from 3 days to 7.
6 May 2025: SMS headers must now carry a suffix showing message type: P, S, T, or G.
13 March 2026: TRAI releases a draft Third Amendment, proposing mandatory AI/ML-based spam detection.
Q1 FY2026-27 (Apr-Jun 2026): 1.48 billion promotional calls are blocked after DND checks, in just one quarter.

Must Know

TRAI regulates spam calls and SMS, known formally as Unsolicited Commercial Communication (UCC). The core rules are the Telecom Commercial Communications Customer Preference Regulations (TCCCPR), 2018.
Consumers register on the National Customer Preference Register (NCPR), commonly called the DND (Do Not Disturb) registry, to block promotional calls and SMS.
Telemarketers must use the 140 series for promotional calls, and the 1600 series for transactional or service calls. This covers banks, insurers, and government-to-citizen communication.
TCCCPR 2018 runs on a blockchain-based Distributed Ledger Technology (DLT) platform, to track and trace commercial communication.
A major February 2025 amendment tightened the rules. The complaint window for reporting spam extended from 3 days to 7, and mixed-content messages are now treated entirely as promotional.
From May 2025, SMS headers must carry a suffix showing message type: P (Promotional), S (Service), T (Transactional), or G (Government).
Registered telemarketers face escalating fines, from ₹25,000 up to ₹2.5 lakh across repeated violations, before blacklisting.

Good to Know

The DND registry has existed since 2007, first as the NDNC Registry. It was replaced by the NCPR in September 2011.
As of mid-2026, only about 224 million of India’s 1.348 billion mobile subscribers, roughly 16%, had registered a DND preference.
In Q1 of FY2026-27 (April-June 2026), 13.16 billion promotional calls originated via the 140 series. 1.48 billion of these were blocked after DND checks.
Over that same quarter, AI-based detection flagged 24.43 billion suspected spam calls and SMS.
TRAI took action against 183,000 telecom resources in that quarter, and blacklisted 263 senders.
In March 2026, TRAI released a draft Third Amendment to TCCCPR 2018. It proposes mandatory AI/ML-based spam detection systems for operators, and stricter controls on bulk automated (A2P) calls. As of this writing, it remains under public consultation, not yet in force.
Auto-dialers and robocalls must be pre-registered with origin telecom providers, before use.

Test Yourself

Great to Know

See Polity0120 — TRAI, the regulator behind this entire framework.
This framework is part of the “Mobile Connectivity” pillar underlying India’s wider digital push. See IndGov0022 — Digital India.
The DND registry only blocks promotional communication. Transactional and service messages, like bank OTPs, delivery updates, and government alerts, can legally reach registered numbers too.
The low ~16% DND registration rate shows a real gap. A protective rule existing is not the same as consumers actually using it.
TCCCPR 2018 wasn’t India’s first such regulation. It replaced an earlier 2010 framework, itself a response to years of unchecked telemarketing.

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