SMS reaches 1.1 billion Indian mobile connections. Unlike WhatsApp (requires smartphone and internet), SMS works on every phone — including feature phones prevalent in tier 2-3 cities and rural India. For businesses targeting the broadest possible Indian audience, SMS remains an essential channel.
India’s SMS ecosystem is heavily regulated by TRAI (Telecom Regulatory Authority of India) — understanding compliance is as important as understanding the channel.
SMS in India: Types and TRAI Regulation
Transactional vs. Promotional SMS
Transactional SMS: Messages that are part of a commercial transaction or service — not promotional. Delivered 24/7.
Examples:
- OTP (one-time password)
- Order confirmation and shipping updates
- Bank balance alerts and transaction notifications
- Appointment reminders
- Flight/train booking confirmations
Transactional SMS does not require DND (Do Not Disturb) consent. You can send to any mobile number as part of a legitimate transaction.
Promotional SMS: Marketing messages — offers, new products, discounts, brand updates. Governed strictly by TRAI.
Rules:
- Can only be sent to non-DND numbers
- Only during 9 AM – 9 PM (IST)
- Sender ID must be pre-registered with TRAI
- Template must be DLT-registered before sending
- Must include opt-out mechanism
Service Implicit / Service Explicit: Service messages (account updates, service information) have intermediate regulations. Consult your telecom provider for specific categorization.
DLT (Distributed Ledger Technology) Registration
Since 2021, TRAI requires all business SMS senders to register:
- Business entity on DLT portal (via major telcos: Airtel, Jio, Vodafone Idea)
- Sender ID (header) registration: Your 6-character sender code (e.g., ADSMGI)
- Template registration: Every SMS message template must be pre-approved
Time to register: 2–5 business days for entity; 1–3 days per template
Where to register: TRAI’s DLT platform via any telecom operator (Airtel Saarthi, Vi DLT, Jio DLT)
Bulk SMS Platforms in India
Choosing a Bulk SMS Provider
Criteria:
- DLT compliance support (essential)
- India delivery rates (aim for 95%+ delivery)
- Pricing per SMS
- API availability
- Reporting and analytics
Popular Indian Bulk SMS platforms:
MSG91:
- Pricing: ₹0.13–₹0.18 per SMS (bulk rates)
- Full DLT support
- Strong API
- Popular with Indian developers
Textlocal (India):
- Pricing: ₹0.15–₹0.22 per SMS
- User-friendly interface
- Good for non-technical users
Kaleyra (formerly Solutions Infini):
- Enterprise-grade platform
- Used by major Indian banks and e-commerce companies
- Custom pricing at scale
Exotel:
- SMS + cloud telephony combined
- Popular for call center + SMS integration
- ₹0.20–₹0.30 per SMS
ValueFirst:
- Large enterprise platform
- Strong delivery across all Indian operators
SMS Pricing in India (2026)
| Volume | Promotional SMS | Transactional SMS |
|---|---|---|
| 1–10,000 | ₹0.18–₹0.25/SMS | ₹0.20–₹0.28/SMS |
| 10K–1L | ₹0.14–₹0.18/SMS | ₹0.15–₹0.22/SMS |
| 1L–10L | ₹0.10–₹0.14/SMS | ₹0.12–₹0.18/SMS |
| 10L+ | ₹0.06–₹0.10/SMS | ₹0.08–₹0.12/SMS |
Note: Transactional SMS often costs slightly more due to higher priority routing.
SMS Campaign Strategy for India
Transactional SMS Best Practices
Order fulfillment sequence:
- Order confirmed: “Your order #[X] for [product] is confirmed! Estimated delivery: [date]. Track: [link]”
- Shipped: “Your order is on the way! Courier: [name], AWB: [number]. Track: [link]”
- Out for delivery: “Your order will be delivered today between 10AM-7PM. Please be available.”
- Delivered: “Delivered! Hope you love your purchase. Rate us: [link]”
COD confirmation (India-critical): “Hi [Name], your COD order for ₹[amount] is ready to ship. Reply YES to confirm, NO to cancel. 99acres Shipping”
This reduces RTO by 25-40%.
Appointment reminders: “Reminder: Your appointment with [Doctor/Service] is tomorrow, [date] at [time]. Reply CANCEL to reschedule.”
Promotional SMS Strategy for India
Craft messages within 160 characters: Hindi SMS: 70 characters per message on Unicode (Hindi) English SMS: 160 characters per SMS
Message formula: [Greeting] + [Offer] + [Expiry/Urgency] + [CTA with link]
“Hi [Name], Diwali Special: 30% off all orders! Offer ends Nov 1. Shop now: [short URL] Reply STOP to opt out”
SMS + WhatsApp sequencing: For important campaigns: Send SMS first → follow up with WhatsApp to those who didn’t open → WhatsApp delivers richer content to higher-intent audience
Personalization: Name personalization in SMS increases response rate 10–20% in India. Use your SMS platform’s personalization variables: “Hi {Name},”
India SMS Timing
Promotional:
- 9 AM – 11 AM: Morning reads
- 12 PM – 2 PM: Lunch hour
- 6 PM – 8 PM: Evening wind-down
Avoid: 9 PM – 9 AM (TRAI restriction); Monday mornings (lower response rates)
Transactional: Send immediately when trigger event occurs. Don’t batch transactional SMS.
SMS vs. WhatsApp for India Marketing
| Factor | SMS | |
|---|---|---|
| Reach | Any mobile number | Requires smartphone + WhatsApp |
| Rich media | No (text only) | Yes (images, video, documents) |
| Cost per message | ₹0.10–₹0.25 | ₹0.14–₹0.80 (API) or free (app) |
| Opt-in required | For promotional only | Yes (for API outreach) |
| Open rate | 90%+ | 98%+ |
| Response rate | 5–15% | 20–45% |
| TRAI regulation | Yes (DLT) | No (Meta’s WhatsApp policies) |
| Feature phone reach | Yes | No |
The India synthesis: Use SMS for transactional messages (especially to broad customer bases including feature phone users) and as backup for WhatsApp failures. Use WhatsApp as primary channel for interactive communication and rich content. Don’t replace one with the other — they serve different purposes.
AdsMG AI focuses on digital paid advertising — Google Ads and Meta Ads — to complement your SMS and WhatsApp marketing with top-of-funnel awareness and customer acquisition. See the platform.
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