India's telecom regulator TRAI says calls from the 1600 series cannot be blocked by any app, while promotional calls from the 140 series can only be blocked via the DND registry.

Key Takeaways

  • Calls from the 1600 series cannot be blocked by any app.
  • Promotional calls from the 140 series can only be blocked through the DND registry.
  • TRAI plans action against apps that violate these anti‑spam rules.

The Telecom Regulatory Authority of India (TRAI) announced on July 10, 2026 that no caller‑identification or call‑blocking application is permitted to block calls originating from the 1600 number series. These numbers are reserved for essential service‑ and transaction‑related communications from banks, insurers, financial service providers regulated by RBI, SEBI, IRDAI and PFRDA, as well as for government‑to‑citizen messages.

Regulatory Framework and Intent

Under the Telecom Commercial Communications Customer Preference Regulation (TCCCPR), any tagging, blocking or filtering of 1600‑series calls is expressly prohibited. TRAI emphasised that assigning a dedicated series to such critical communications is meant to enhance trust among citizens and curb fraudulent or spammy practices. Conversely, the 140 number series is earmarked for registered telemarketers, and users may opt‑out of these promotional calls by registering their preferences on the Do Not Disturb (DND) registry.

Truecaller’s Pushback

Call‑management app Truecaller has publicly challenged TRAI’s stance, arguing that spammers exploit the exemption and that over 525,000 users are flagging 1600‑ and 140‑series numbers as spam daily. CEO Rishit Jhunjhunwala contended that the regulator’s blanket prohibition on marking these numbers as spam is fueling the very problem it seeks to solve. He cited figures indicating more than 5.1 crore unanswered calls per day from the two series, with a sharp rise in manual blocking actions since October 2025.

TRAI’s Next Steps

TRAI has sought authorization from the Ministry of Electronics and Information Technology to take action against apps that breach its anti‑spam directives. The regulator reiterated that while 140‑series calls can be blocked only through the DND registry, no other tagging or filtering is allowed, to prevent misleading customers who have opted to receive certain promotional calls. This nuanced approach aims to protect consumers while preserving the integrity of essential service communications.