SMS still has the best open rate of any marketing channel — around 98%, with most messages read within 3 minutes of delivery. Yet many Indian businesses blast the same generic offer to their entire database and see conversion rates below 0.5%. The gap between a campaign that burns budget and one that pays for itself comes down to a handful of decisions made before you press send. Here are the strategies that consistently work for businesses sending bulk SMS in India.
1. Segment Before You Send
A single list treated as one audience is the most common mistake in bulk SMS marketing. Segmented campaigns routinely produce 2–3x the click-through rate of unsegmented blasts because the offer actually matches the recipient.
Segments that work for Indian audiences
- Purchase recency: customers active in the last 30 days respond very differently from those dormant for 6 months. Send win-back offers only to the dormant group.
- Location: a store offer in Coimbatore is noise to a customer in Delhi. City-level targeting also lets you reference local festivals and events.
- Language preference: Hindi, Tamil or Telugu messages in Unicode often outperform English for tier-2 and tier-3 city audiences, even though Unicode reduces you to 70 characters per SMS segment.
- Average order value: reserve high-value coupon codes for customers who have historically spent more; give smaller nudges to occasional buyers.
2. Time Campaigns Around Indian Behaviour — and TRAI Rules
TRAI regulations restrict promotional SMS to 9:00 AM to 9:00 PM. Messages submitted outside this window are dropped by operators, so scheduling is not optional — it is compliance. Within the legal window, timing still matters:
- 10:30 AM – 12:30 PM: strong slot for B2C offers; people have settled into their day and check phones between tasks.
- 6:00 PM – 8:30 PM: best for food delivery, e-commerce and entertainment offers, when people are commuting or relaxing.
- Avoid Monday before 11 AM and the last hour before 9 PM, when operator queues are congested with everyone else's end-of-day sends.
- Plan the festival calendar early. Diwali, Dussehra, Eid, Pongal and Onam weeks see the highest SMS volumes of the year. Get templates approved on the DLT portal at least a week in advance, because approval queues slow down before festivals.
3. Write Messages That Fit One SMS Segment
A standard SMS is 160 characters in the GSM-7 character set, or 70 characters in Unicode (needed for Hindi, Tamil and other Indian scripts). Go one character over and you pay for two segments — doubling the cost of the entire campaign. A tight structure that fits one segment:
- Brand name first — recipients see an alphanumeric sender ID like AB-QIKSMS, but the brand in the text builds recall.
- One specific offer — "Flat 20% off till Sunday" beats "Exciting offers inside".
- One clear CTA — a short link, a coupon code, or a call number. Never two CTAs.
- Opt-out path — required for promotional traffic and it protects your sender reputation.
4. Use the Right Route for the Right Message
Under India's DLT framework, message categories are not interchangeable. Sending marketing content on a transactional route is the fastest way to get a header suspended.
| Route | Content allowed | Time window | DND numbers |
|---|---|---|---|
| Promotional | Offers, discounts, marketing | 9 AM – 9 PM | Blocked |
| Service Implicit | Order updates, alerts, reminders | 24x7 | Delivered |
| Service Explicit | Offers to customers with recorded consent | 9 AM – 9 PM | Delivered with consent |
| Transactional | OTPs only (banks and critical services) | 24x7 | Delivered |
If a promotional campaign matters to your revenue, collect explicit consent and move those customers to the service-explicit route — it is the only compliant way to reach DND-registered numbers with offers, and roughly half of Indian mobile numbers have DND preferences set.
5. Personalise With Template Variables
DLT content templates support variables using the {#var#} placeholder. Use them for the customer's name, order ID, amount or appointment time. Two practical cautions: each variable is capped at 30 characters by operator rules, and a template that is mostly variables with little fixed text is likely to be rejected during registration. Messages with a name in them consistently see higher click-through than anonymous blasts, so register personalised versions of your core templates.
6. Track the Four Numbers That Matter
- Delivery rate: 90–98% is healthy for a clean list on a good route. Below 85% means stale numbers or template mismatches.
- Click-through rate: 5–10% is achievable with a relevant offer and a short link. Use a URL shortener that supports UTM parameters so clicks show up in Google Analytics.
- Conversion rate: tie coupon codes to campaigns so revenue is attributable per send.
- Opt-out rate: above 1% per campaign is a warning sign that frequency or targeting is off. Cap promotional sends at 4–6 per month per customer.
7. Control Cost Without Killing Quality
Bulk SMS in India typically costs between 12 and 25 paise per message depending on volume, route and provider. The levers that actually reduce cost per conversion: keep messages to one segment, suppress invalid and inactive numbers before sending, and buy volume tiers that match your realistic monthly usage instead of letting credits expire. A reliable gateway with transparent delivery reports matters more than saving 2 paise per SMS — undelivered messages are the most expensive kind. See current routes and volume pricing on our bulk SMS service for India page.
Frequently Asked Questions
How many SMS should I send per campaign?
Send to the segment the offer is relevant for, not the whole database. For most retail businesses, 4–6 promotional messages per customer per month is the ceiling before opt-out rates climb. One well-targeted send to 10,000 relevant numbers beats a blast to 100,000.
What is a good click-through rate for bulk SMS in India?
With a segmented list, a specific offer and a trackable short link, 5–10% is a realistic target. Unsegmented promotional blasts usually land between 1% and 3%. Anything under 1% suggests the offer, timing or audience is wrong.
Can I send promotional SMS to DND numbers?
Not on the promotional route — operators scrub DND numbers automatically. The compliant path is recording explicit customer consent on the DLT platform and sending through the service-explicit category, which reaches DND numbers between 9 AM and 9 PM.