Country Summary

Country nameIndia
ISO codeIN
RegionAsia
Mobile country code404, 405
Dialing code+91
Major carriersAirtel, Vodafone India, Idea Cellular, Reliance Jio, BSNL, Aircel, Reliance Communication

Guidelines

Two-way SMS supported No
Number portability availableYes
Twilio concatenated message supportYes
Message length160 characters
Twilio MMS supportConverted to SMS with embedded URL
Sending SMS to landline numbersYou cannot send SMS to a landline destination number: the Twilio REST API will throw a 400 response with error code 21614, the message will not appear in the logs, and the account will not be charged.
Compliance considerations

Twilio fully supports all types of traffic to India, including promotional, transactional, and International Long Distance Operator (ILDO) messages. You must submit promotional or marketing messages between 09:00 and 21:00 local time; anything submitted outside this time will be processed the next day. Promotional messages sent using Sender IDs will be overwritten with a 6-digit short code (XX-NNNNNN), and messages sent to numbers registered in the do-not-disturb database will be blocked. You can find more information here: https://support.twilio.com/hc/en-us/articles/223134167-Limitations-sending-SMS-messages-to-Indian-mobile-devices

You should send transactional content such as alerts, banking, and OTPs through a carrier-approved transactional connection. To bypass the do-not-disturb database, you must:

  1. Submit all your message templates for whitelisting.
  2. Register a 6-character, no special characters, and all uppercase Alphanumeric Sender ID.

Due to regulations, Sender IDs will be prefixed with an India 2-letter prefix source (YZ-ABCDEF) where Y connotes the service provider sending the SMS and Z connotes the telecom circle from which the SMS was sent.

Sending non-whitelisted content will result in delivery failure, and sending promotional or marketing content through the transactional connection will result in a penalty imposed by mobile operators. You must submit over-the-top (OTT) traffic originating outside India through a dedicated connection and not through conventional promotional or transactional connections. OTT messages need to go through mobile carriers' ILDO connections and have to be terminated with either a short code or a long number. Mobile carriers are actively blocking OTT messages submitted through non-authorized connections.

Twilio strongly encourages customers to review proposed use cases with qualified legal counsel to make sure that they comply with all applicable laws. The following are some general best practices:

  1. Get opt-in consent from each end user before sending any communication to them, particular for marketing or other non-essential communications.
  2. Only communicate during an end user's daytime hours unless it is urgent.
  3. SMS campaigns should support HELP/STOP messages, and similar messages, in the end user's local language.
  4. Do not contact end users on do-not-call or do-not-disturb registries.

Phone Numbers & Sender ID

AlphanumericLong CodeShort Code
Pre-registrationDynamicDomesticInternational
Operator network capabilityRequiredNot SupportedNot Supported --- ---
Twilio supportedRequiredNot SupportedSupported --- Not Supported
Sender ID preservedYesNoNo --- No
Provisioning time1 week------------
UCS-2 support---------------
Use case restrictions

You may use Alphanumeric Sender IDs only for transactional messages. Examples of transational messages include 2-factor authentication codes, pin codes, and delivery notifications.

No promotional and marketing messages are allowed. Failure to comply will result in traffic being blocked and the number blacklisted. 

---

May only be used for promotional content.

---
---
Best practices

By default, Twilio sends messages to India as promotional messages.

Pre-register your Alphanumeric Sender ID only when sending transactional content to bypass the DND database/time restrictions.

Create a subaccount and separate transactional SMS traffic to ensure compliance.

---
---
---
---
Alphanumeric - Pre-registration
Operator network capabilityRequired
Twilio supportedRequired
Sender ID preservedYes
Provisioning time1 week
UCS-2 support---
Use case restrictions

You may use Alphanumeric Sender IDs only for transactional messages. Examples of transational messages include 2-factor authentication codes, pin codes, and delivery notifications.

No promotional and marketing messages are allowed. Failure to comply will result in traffic being blocked and the number blacklisted. 

Best practices

By default, Twilio sends messages to India as promotional messages.

Pre-register your Alphanumeric Sender ID only when sending transactional content to bypass the DND database/time restrictions.

Create a subaccount and separate transactional SMS traffic to ensure compliance.

Alphanumeric - Dynamic
Operator network capabilityNot Supported
Twilio supportedNot Supported
Sender ID preservedNo
Provisioning time---
UCS-2 support---
Use case restrictions
---
Best practices
---
Long Code - Domestic
Operator network capabilityNot Supported
Twilio supportedSupported
Sender ID preservedNo
Provisioning time---
UCS-2 support---
Use case restrictions

May only be used for promotional content.

Best practices
---
Long Code - International
Operator network capability ---
Twilio supported ---
Sender ID preserved ---
Provisioning time---
UCS-2 support---
Use case restrictions
---
Best practices
---
Short Code
Operator network capability---
Twilio supportedNot Supported
Sender ID preservedNo
Provisioning time---
UCS-2 support---
Use case restrictions
---
Best practices
---

For the benefit of all our customers, these guidelines are provided to help you comply with applicable requirements and to help ensure Twilio's platform remains compliant with global telecommunications ecosystem requirements. These guidelines represent our current understanding of common compliance requirements generally applicable to Twilio and its customers, and do not constitute legal advice. By posting these guidelines, Twilio makes no assurances regarding the legal compliance of your application built using our APIs. You are expected to understand and abide by all compliance obligations applicable to your specific application. You should check these pages regularly for updates as telecommunications ecosystem requirements continue to evolve and change, and the information below may be updated or changed without notice.