Introduction
Many businesses confuse transactional SMS with promotional SMS, leading to compliance issues and poor delivery. Understanding the difference is crucial for effective customer communication.
What is Transactional SMS?
Transactional SMS contains information that the recipient expects or needs. These messages are not for marketing purposes but for delivering critical updates, alerts, and notifications that the customer has explicitly or implicitly requested.
What is Promotional SMS?
Promotional SMS is used for marketing and advertising purposes. These messages promote products, services, offers, or events. They can only be sent to non-DND numbers during permitted hours (9 AM to 9 PM in India).
Key Differences
| Purpose | Transactional: Information / Promotional: Marketing |
| DND Delivery | Transactional: Yes (24/7) / Promotional: No |
| Timing | Transactional: Anytime / Promotional: 9 AM – 9 PM |
| Sender ID | Transactional: 6-char alphabetic / Promotional: 6-digit numeric |
| Content | Transactional: Alerts, OTPs, updates / Promotional: Offers, deals |
| Route | Transactional: High-priority / Promotional: Standard |
| DLT Category | Transactional: Service Implicit / Promotional: Promotional |
| Open Rate | Transactional: 95%+ / Promotional: 15-20% |
When to Use Transactional SMS
- 1OTP and verification codes
- 2Order confirmations and tracking updates
- 3Payment confirmations and invoices
- 4Appointment reminders
- 5Account alerts and security notifications
- 6Delivery status updates
- 7Booking confirmations
- 8Password reset links
When to Use Promotional SMS
- 1Product launches and announcements
- 2Discount offers and flash sales
- 3Seasonal promotions and festivals
- 4New store opening invitations
- 5Referral program invitations
- 6Event invitations and RSVPs
- 7Loyalty program updates
- 8Cross-selling and upselling campaigns
Key Takeaways
Use transactional SMS for critical information (24/7, all numbers). Use promotional SMS for marketing (9 AM-9 PM, non-DND only). Never mix the two — it violates TRAI regulations and hurts delivery rates.
