Not all bulk SMS is the same. Choosing the right category keeps you compliant, controls cost and makes sure your messages actually reach customers. Here's the difference.
Transactional SMS
Triggered by a customer action — OTPs, payment confirmations, order updates, account alerts. These can be delivered 24×7, even to DND numbers, because they are essential. They use a dedicated high-priority route, so OTPs land in seconds.
Service (implicit / explicit) SMS
Service messages relate to an existing relationship — appointment reminders, delivery alerts, renewal notices. Service-explicit messages (with customer consent) can carry limited promotional content.
Promotional SMS
Marketing content — offers, discounts, festival campaigns, new launches. These are sent to non-DND numbers and are restricted to 9am–9pm. Ideal for retailers, showrooms and event promotions.
Which should you use?
If you're sending OTPs and alerts, you need transactional. If you're running offers and campaigns, you need promotional — and you'll want both if you do customer service and marketing. Each requires its own DLT header and templates.
Set up the right mix
AvanceZone configures the correct routes, headers and templates for your use case so nothing fails and nothing breaks compliance. Explore bulk SMS in Coimbatore or get a free demo.