In India, the TRAI regulatory body separates bulk SMS into two types: Promotional and Transactional.

Let’s break down the difference between both in this guide.

Quick Comparison: Promotional Vs Transactional SMS

The key difference between promotional and transactional SMS is their intent. Promotional SMS is used with marketing intent, while transactional SMS is used with informational intent.

Below is the brief overview.

Feature	Promotional SMS	Transactional SMS
Purpose	Marketing and Sales	Important Alerts / OTPs
Timing	10 AM to 9 PM only	24/7 (Anytime)
DND Policy	Blocked on DND numbers	Delivered to DND as well
Sender ID	6-digit number (123456)	6-letter alphabets (BRANDX)
DLT Category	Promotional / Service Explicit	Service Implicit / Transactional

1. What is Promotional SMS?

Promotional SMS is used for marketing. Its only goal is to sell something or promote your brand.

Key Rules:

Time Limit: You can only send these between 10 AM and 9 PM. Sending them at night is illegal.
DND Filter: Many people register for “Do Not Disturb” (DND). You cannot send promotional texts to these numbers.
Sender ID: These messages come from a 6-digit numeric ID. You cannot use your brand name as the sender ID here.
Consent: You must have the customer’s permission before sending marketing texts.

Examples of Promotional SMS:

“Flash Sale! 20% off on all shoes. Shop now at [Link].”
“Happy Diwali! Visit our store for a special gift.”

What is Transactional SMS?

Transactional SMS is for “service-based” info. These are usually triggered by an action the customer took (like buying a product or trying to log in).

Key Rules:

No Time Limit: Since these are urgent, you can send them 24/7.
Bypasses DND: These messages will reach everyone, even if they have DND activated.
Sender ID: You get a 6-letter alphabetic ID (like TATAIN or HDFCBK). This helps customers trust that the SMS is real.
No Marketing: You are not allowed to put offers or sales links in a transactional message. If you do, your SMS will be blocked & DLT account will be flagged.

Examples of Transactional SMS:

“Your order #552 has been packed and is ready for shipping.”
“Your bank account has been credited with ₹5,000.”
“Your OTP for login is 9876.”

How To Send: Promotional SMS Vs Transactional SMS

Both promotional and transactional SMS can be efficiently sent using a web dashboard or by integrating an SMS API.

A web dashboard offers a user-friendly interface for businesses to manually upload contacts, craft messages, and schedule campaigns, ideal for small-scale or one-off sends.

For larger operations or automation, integrating an SMS API allows seamless connection with CRM or e-commerce platforms, enabling real-time triggers like order updates or personalized offers based on different scenarios.

If you haven’t chosen a platform yet, you can compare the 5 Best Bulk SMS Service Providers in India to find the right fit for your delivery needs and budget.

Critical Rules for India (DLT Compliance)

All businesses in India must register on a DLT platform (like Jio, Vodafone, or Airtel) in order to send bulk SMS.

No Mixing: You cannot put a marketing link or a “sale” offer inside a Transactional SMS. If you do, the operators will block your messages and even account.
Template Approval: Every message you send must be pre-approved on the DLT portal before you can send it.
Sender ID (Headers): You must register your 6-letter Header (for Transactional) or 6-digit Header (for Promotional) on the portal first.

Start Sending Today

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