National Telecom Specification

India (+91) Country Calling Code & SMS Guide

Complete engineering reference for phone numbering formats, domestic trunk prefixes, cellular mobile operator allocations, and regulatory A2P SMS requirements in India.

Quick Jump: Numbering Plan A2P Regulations Verify IN Number

Country Dialing Code +91 ISO: IN

Domestic Trunk Prefix 0 Omitted internationally

National Length 10 digits (mobile) Local subscriber digits

Full E.164 Length 12 digits (+91 xxxxx xxxxx) With +91 prefix

Telephony Architecture & Carrier Allocations

Destination Codes: STD Area Codes, Mobile 6/7/8/9

Mobile Prefix Patterns: 6xxx, 7xxx, 8xxx, 9xxx allocated by DoT across telecom service circles (LSA)

Major Mobile Network Operators: Reliance Jio, Bharti Airtel, Vodafone Idea (Vi), BSNL

A2P Messaging Regulations & Firewall Policies

A2P 10DLC & Campaign Registration

Not applicable. Governed by TRAI Telecom Commercial Communications Customer Preference Regulations (TCCCPR).

Alphanumeric Sender ID Support

Supported as 6-character alphabetic headers for transactional traffic. Strictly requires registration on carrier DLT (Distributed Ledger Technology) platforms.

Two-Way Messaging Capability

Supported via registered long codes (10 digits) or virtual mobile numbers.

Character Encoding Standards

GSM-7 for Latin text; UCS-2 for Devanagari and regional Indian scripts.

Compliance Framework: TRAI DLT registration of Principal Entity (PE), Header/Sender ID, and Content Templates. Unregistered messages are filtered at carrier gateways.

Interactive Number Intelligence

Test a India Number Now

Check if a India phone number conforms to the national numbering plan, classify mobile vs VoIP allocation, and obtain canonical E.164 standardization.

Frequently Asked Questions for India

What is the international calling code for India?

India's country calling code is +91. Mobile numbers consist of 10 digits starting with 6, 7, 8, or 9.

What is TRAI DLT registration for sending SMS to India?

TRAI mandates that all commercial entities register their business identity, sender headers, and message content templates on a blockchain-based DLT platform with Indian carriers before sending A2P messages.

Related National Calling Codes

Australia +61 Austria +43 Belgium +32 Brazil +55 Canada +1 France +33 Germany +49 Indonesia +62