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SMS Marketing That Reaches Every Phone and Follows TRAI Rules

SMS still reaches almost every mobile phone in India, with or without internet. We help you register on DLT, get templates approved, and send short, timely messages that people actually read and act on.

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SI Marketing

Last updated: 08 October 2026 ยท Reviewed by Kamal Dev, CEO & Co-Founder, Shivah Web Tech

What are SMS marketing services and how do they work in India?

SMS marketing services help a business send promotional, transactional and service text messages to customers' phones within TRAI rules. In India, every business sender must register on a DLT platform with its entity, sender ID (header) and message templates. The service then covers list segmentation, message writing, timing, tracked links and reporting so messages bring visits, bookings and sales.

Key takeaways

  • DLT registration of entity, header and templates is mandatory in India.
  • Promotional, transactional and service messages follow different rules.
  • Promotional SMS cannot reach numbers on the DND list.
  • Short messages with one clear action and a tracked link work best.
  • SMS is ideal for OTPs, alerts, reminders and time-bound offers.
  • Combine SMS with WhatsApp and email for a complete reach plan.

What is SMS marketing?

SMS marketing is sending short text messages to customers' phones to share offers, reminders and updates. Our SMS marketing services handle the compliance, writing, sending and tracking for you.

SMS marketing: Using text messages (up to 160 characters per part in English) to reach customers with offers, alerts, reminders and service updates, sent through a registered sender ID.

SMS works on every mobile phone, including basic phones without internet. It does not need an app. That makes it valuable in smaller towns and for older customers. For banks, clinics, schools and ecommerce brands, SMS is also the standard channel for OTPs, payment alerts and delivery updates.

SMS marketing in India is tightly regulated. Messages that break the rules are simply blocked by telecom operators. So good SMS marketing starts with correct registration and templates, not with a big contact list.

What is DLT registration and why is it needed?

DLT (Distributed Ledger Technology) registration is the system TRAI requires for every business that sends commercial SMS in India. Without it, telecom operators block your messages.

Under TRAI's commercial communication rules, businesses must register on a DLT portal run by a telecom operator. Registration on one operator's portal works across networks.

What you registerWhat it meansExample
Entity (principal entity)Your business, verified with documents like GST or PANYour company or shop
Header (sender ID)The short name shown as the senderA short code based on your brand name
Content templateThe fixed text of each message with variable parts marked"Your order {#var#} has been shipped"
Consent templateNeeded for some message types that require customer consentOpt-in confirmation wording

Your SMS provider then sends messages that match the registered template and header. If the text changes outside the variable parts, the message can fail. We help prepare documents, headers and templates so approvals go smoothly.

Promotional vs transactional vs service SMS: what is the difference?

Promotional SMS sells, transactional SMS confirms banking-style actions like OTPs, and service SMS gives updates customers expect. Each type has its own rules for who can receive it and when.

TypeUsed forKey rule
PromotionalOffers, sales, new launchesNot delivered to DND numbers; only during allowed hours
TransactionalOTPs and alerts, mainly from banksStrict use only for the transaction
Service implicitOrder updates, delivery, appointment reminders to existing customersMust relate to a service the customer is using
Service explicitMessages sent based on clear customer consentNeeds recorded consent
The exact categories and rules are set by TRAI and can be updated. We check current rules with your SMS provider at setup, so messages are marked correctly and delivered.

Who should use SMS marketing?

SMS marketing suits businesses with many customers, short time-bound messages, or customers who may not use smartphones often. It works best for reminders and quick offers.

Retail and showrooms

Sale alerts, festival offers and new stock updates to past buyers.

Ecommerce

Order, shipping and delivery updates, plus cash on delivery confirmations.

Clinics and diagnostics

Appointment and report-ready reminders.

Schools and coaching

Fee reminders, exam dates and admission alerts.

Real estate

Site visit confirmations and launch alerts.

Restaurants and salons

Booking confirmations and offers on slow days.

For rich content like images, catalogues and two-way chats, WhatsApp marketing is a better channel. Many businesses use SMS as a backup for customers who are not on WhatsApp.

What is included in our SMS marketing service?

We cover DLT support, provider setup, list building, message writing, sending and reporting. You stay the owner of your sender ID and contact list.

  • Help with DLT entity, header and template registration
  • Choosing and setting up a reliable SMS provider
  • Cleaning and segmenting your contact list by city, purchase or interest
  • Writing short messages that fit approved templates
  • Tracked short links with UTM tags to measure visits and sales
  • Scheduling at times your customers are likely to read
  • Automated messages from your website, store or CRM
  • Monthly report with delivery, clicks and conversions

Automated SMS, such as order updates and reminders, can be linked to your systems as part of our marketing automation work.

How do we run an SMS campaign step by step?

We check compliance first, then segment, write, test and send, and measure results. Here is the process.

  1. 1

    Compliance check

    We confirm your DLT entity, headers and templates, or help you register.

  2. 2

    List review

    We remove duplicates and invalid numbers and check how consent was collected.

  3. 3

    Segmentation

    We split the list by city, past purchase, last visit or interest.

  4. 4

    Message writing

    We write short messages with one offer and one link, matched to an approved template.

  5. 5

    Test send

    We send to internal numbers to check delivery, sender name and link.

  6. 6

    Schedule and send

    We send at the best time within allowed hours for promotional messages.

  7. 7

    Measure

    We track delivery, clicks, visits and sales, then improve the next campaign.

How do you write an SMS that people act on?

Write for one person, put the benefit first, keep it short, and give one clear action with a short link. Every word must earn its place.

  • Start with the brand name so people know who it is from
  • Put the main benefit or news in the first line
  • Use one offer and one link only
  • Add a clear end date for time-bound offers
  • Use the customer's language: English, Hindi or Punjabi where your template allows
  • Avoid ALL CAPS and too many symbols, which look like spam
  • Include opt-out details where required

Example structure

Best times to send

Promotional SMS can only go out during the hours TRAI allows, which are daytime hours. Within that window, late morning and early evening often work well for consumers, while working hours suit B2B buyers. Avoid sending right before a holiday when people are busy travelling. We test timings for your audience and keep the ones that bring the most clicks.

Brand name, then the offer, then the deadline, then the link. For example: a showroom telling past buyers about a weekend exchange offer with a short link to book a visit. Keep it to one SMS part where possible, since longer messages cost more and get skimmed.

SMS vs WhatsApp vs email: which should you use?

Use SMS for short, urgent and must-reach messages; WhatsApp for rich, two-way conversations; and email for longer content and newsletters. Most businesses do best with all three.

PointSMSWhatsAppEmail
Needs internetNoYesYes
Rich mediaNo, text onlyImages, video, buttonsFull design
Two-way chatLimitedYesSlow
Best forOTP, alerts, reminders, quick offersSales chats, updates, supportNewsletters, detailed offers
Key rule in IndiaDLT and TRAI rulesMeta opt-in and templatesSpam and consent rules

See our email marketing page for newsletters and longer campaigns. For the full plan across channels, our digital marketing team can help.

What affects the cost of SMS marketing?

Costs come from per-message charges by the SMS provider, DLT registration fees set by the portal, and our setup and campaign work. You get a clear quote after a free call.

  • Number of messages per month and number of SMS parts per message
  • Type of message: promotional, transactional or service
  • Number of headers and templates to register
  • Automation and integration with your website or CRM
  • How many campaigns we plan and write each month

Mistakes to avoid

  • Sending to old or bought lists with no consent
  • Changing message text so it no longer matches the template
  • Messaging the whole list for every offer
  • No tracked link, so you cannot see results
  • Sending too often, which leads to complaints

Frequently Asked Questions

Is SMS marketing still effective in India?

Yes, for the right uses. SMS reaches almost every phone without internet and is read quickly, which makes it strong for reminders, alerts and short offers. It is less suited to long or visual content. Most businesses get the best result by using SMS alongside WhatsApp and email, each for a different job.

Is DLT registration mandatory for SMS in India?

Yes. TRAI rules require every business sending commercial SMS to register its entity, sender ID headers and message templates on a DLT platform. Messages that do not match registered details are blocked by telecom operators. We help with documents, headers and template wording for faster approval.

Can I send promotional SMS to DND numbers?

No. Promotional messages are not delivered to numbers registered on the Do Not Disturb preference list. Service and transactional messages that meet the rules can still be delivered. This is why correct message classification matters. We help mark each template as the right category.

How long does DLT registration take?

Entity registration usually takes a few working days once correct documents are submitted. Headers and templates are often approved faster, though rejected templates need edits and resubmission. Timelines vary by operator portal. We prepare clean templates to reduce back and forth.

What is a sender ID in SMS marketing?

A sender ID, also called a header, is the short name that appears as the sender of your SMS instead of a phone number. It is usually based on your brand name. In India it must be registered on DLT, and it helps customers trust that the message is really from you.

Can SMS be sent in Hindi or Punjabi?

Yes. SMS supports Indian languages using Unicode. Note that Unicode messages fit fewer characters in each SMS part than English, so longer messages may cost more. Templates in Indian languages must also be registered on DLT like English templates.

Can SMS be automated from my website or store?

Yes. Order confirmations, shipping updates, appointment reminders and abandoned cart messages can be sent automatically through your SMS provider's API or a plugin. Each automated message still needs a registered template. We set up and test these triggers with your website or CRM.

How do I measure results from SMS marketing?

Add a short tracked link with UTM tags to each message so your analytics shows visits and sales from SMS. For offline stores, use a unique offer code for each campaign and ask staff to record it. Your provider report shows delivery, and together these show which messages actually brought customers.

Talk to our team today

Call or WhatsApp +91 70188 14716. We reply fast, Monday to Friday.