Quick Answer: A transactional SMS service sends automated, event-triggered messages — OTPs, order confirmations, payment alerts, appointment reminders — to customers 24/7, including to DND-registered numbers. In India, transactional SMS requires TRAI-DLT registration under the "Service Implicit" or "Service Explicit" category. TechTo Networks delivers transactional SMS in under 2 seconds via Tier-1 direct carrier connections, with 99.99% uptime SLA and fully managed DLT compl
