When you register SMS templates on DLT you must pick a category. Choosing between service implicit and service explicit decides whether a message needs recorded customer consent — and whether it gets blocked. As a bulk SMS service provider in India, PromoMarketingSolution helps you with every step.
The categories at a glance
| Category | What it is for | Consent needed | Header |
|---|---|---|---|
| Transactional | OTPs completing a banking transaction | No | 6 letters |
| Service implicit | Updates about something the customer already did or bought | No — implied by the relationship | 6 letters |
| Service explicit | Messages the customer agreed to receive, which may include offers | Yes — recorded on DLT | 6 letters |
| Promotional | Marketing to anyone not opted out | No, but DND applies | 6 digits |
Service implicit examples
- Your order #1234 has shipped
- Your EMI of ₹5,000 is due on 5 March
- Your appointment is confirmed for 4 PM tomorrow
- Your account password was changed
Service explicit examples
Service explicit covers messages a customer has specifically opted in to, such as offers from a brand they subscribed to, or reminders about products related to ones they own. Consent must be captured through a consent template on DLT, and the customer can revoke it.
Which should you choose?
If the message relates directly to a transaction or account the customer has with you and has no marketing content, register it as service implicit. If it contains any offer or upsell but you want it to reach DND numbers, you need service explicit with recorded consent. Otherwise, use promotional.
Frequently asked questions
Can service implicit SMS contain offers?
No. Adding promotional content to a service implicit template is a common reason for rejection or blocking.
How is consent recorded for service explicit SMS?
You register a consent template on DLT and capture the customer's consent, usually through an OTP-verified opt-in, which is logged on the ledger.