Transactional & OTP SMS
Reaches Every Number, Every Time.
Your customers expect their OTPs and alerts in seconds, not minutes. Digimiles delivers on a dedicated & direct route – so every login, every payment, every alert, every reminder reaches them without delay.
Bypasses DND. Legally.
Credits Never Expire
Zero Setup Cost
< 10 secAverage Delivery Time
98%Delivery Rate
10M+Messages Per Month
2,000+Businesses Across India
TRAIRegulated route. Real delivery.
Why Businesses Trust Digimiles
Built For Messages That Cannot Afford To Fail
Under 10-Second Delivery
A 30-second delay on an OTP means a lost login. A missed payment alert means a worried customer. Digimiles makes sure neither happens.
Reaches Every Number
DND or not, transactional SMS goes through. Our dedicated route is TRAI-compliant and bypasses DND filters – legally, every time.
REST API, Ready In Minutes
Set up SMS automation flows to trigger messages based on user actions using our ready to use and flexible API. Download API Docs
Credits That Never Expire
Buy when it suits you, use when you need to. No monthly renewal pressure, no credits going to waste at end of billing cycle.
Zero Setup Cost
No onboarding fees, no hidden charges. You pay only for the SMS you send – straightforward pricing, nothing buried in the fine print.
98% Delivery Rate
Backed by real delivery logs, not marketing copy. Our 98% rate holds across industries – schools, banks, clinics, apps, and more.
Works For Every Use Case
If It Needs To Reach Someone Fast, This Is Your Route
Finance & Banking
OTP & Verification
Payment & Bank Alerts
Loan & EMI Reminders
Insurance Policy Alerts
E-commerce & Logistics
Order Confirmations
E-commerce Notifications
Logistics & Delivery Updates
Travel & Booking Updates
Healthcare
Appointment Reminders
Clinic & Hospital Alerts
Lab Report Notifications
Discharge & Follow-up Alerts
Education
School & College Alerts
Exam & Result Notifications
Fee Payment Reminders
Timetable & Event Updates
Business & HR
Staff & Employee Alerts
Recruitment Notifications
Real Estate Follow-ups
Automobile Service Alerts
Tech & Apps
App Notifications via SMS
API-Triggered Alerts
Delivery Status Webhooks
System & Downtime Alerts
Important Notice
Under TRAI’s TCCPR 2018, Transactional SMS is also called Service Implicit or Service Inferred messaging on the DLT portal. It cannot be used to advertise your products – even to existing customers. For that, use our Promotional SMS service.
How to Send Transactional SMS
Go live in 4 simple steps
1
Buy a Plan
Pick any plan that suits your needs. No setup fee, credits never expire.
2
Complete DLT Registration
Mandatory for all businesses in India. Follow our guide or we’ll do it for you.
₹5,900 registration fee / year3
Sender ID & Templates
Get your Sender ID and SMS templates approved on the DLT portal.
4
Share & Start Sending
Share the approved Sender ID and templates with us to set up your account.
Simple, Transparent Pricing
Pay once. Use anytime. Credits never expire.
No setup fee. Credits never expire. Same dedicated route, same delivery speed – regardless of which plan you pick.
Need more than 2,00,000 SMS? Call us and we’ll put together a custom plan for your volume.
9916011355
Important Update on GST
To avail of the GST Input credit, you need to provide your valid and active GSTIN to our email (info@digimiles.in) and on the online payment page. Please verify your GSTIN status from the GST portal before updating us.
Please note – if your GSTIN status is shown as Invalid, Suspended, or Deleted, all your transactions will be reported as B2C transactions and you will not be able to claim the GST Input credit for those transactions.
Frequently Asked Questions
Everything you need to know about Transactional SMS
About Transactional SMS
DLT & Compliance
Transactional SMS is used to send important, time-sensitive messages to your customers – like OTPs, payment alerts, order updates, and appointment reminders. It is not for advertising. Unlike promotional SMS, it can reach numbers on the DND list and can be sent at any time of day.
Transactional SMS is for essential messages like OTPs and alerts – it reaches DND numbers and can be sent 24/7. Promotional SMS is for offers and marketing – it cannot reach DND numbers and can only be sent between 9am and 9pm. Both types require DLT registration before use.
These are just the DLT portal’s terms for transactional SMS. When you register on the DLT portal, you will see your message category listed as Service Implicit or Service Inferred – both mean the same thing as transactional SMS. There is no difference in how the messages are sent or delivered.
Yes. Transactional SMS bypasses DND filters – legally. TRAI allows this because essential messages like OTPs and bank alerts must reach the customer regardless of their DND status.
OTP SMS is one type of transactional SMS. Transactional SMS also covers bank alerts, order confirmations, appointment reminders, school notifications, and more.
Yes, it is mandatory. TRAI made DLT registration compulsory for all businesses sending SMS in India. Without it, your messages will simply not be delivered – telecom operators block unregistered traffic. You need to register your entity, Sender ID, and message templates on the DLT portal before you can send even a single SMS.
A Sender ID is the 6-character name that shows up as the sender on your SMS – for example, DIGMLS or HDFCBK. It tells your customer who the message is from. The Sender ID must match your company or app name in short form and needs to be registered on the DLT portal before you can send any SMS.
Your messages will not be delivered. Since 2021, TRAI has made DLT registration mandatory for all businesses sending SMS in India. Any message sent without a registered Sender ID and approved template will be blocked by the telecom operators.
There is no fixed limit on how many Sender IDs you can register. However, each Sender ID must relate to your company or app name – you cannot register random names. If you run multiple products or brands, you can register a separate Sender ID for each.
Yes. You can choose your own 6-character Sender ID as long as it represents your brand or company name. It has to be approved on the DLT portal – generic or unrelated names will be rejected. Once approved, your messages will show your brand name instead of a random number.
Delivery & Technical
API & Integration
Pricing & Account
Usually between 3 to 10 seconds for OTPs and transactional messages. However, delivery time can vary depending on the receiver’s network – some networks may take slightly longer during peak hours or in low signal areas.
Yes. Digimiles supports most Indian languages including Hindi, Tamil, Telugu, Kannada, Malayalam, Bengali, and more. Regional language SMS uses Unicode encoding – the character limit is 70 per message instead of the usual 160 for English text.
You can check delivery reports in three ways – through your Digimiles dashboard, by downloading manual reports, or via API callback if you are a developer. The API callback lets your system receive real-time delivery status automatically without logging in.
Yes. Digimiles provides a REST API for sending transactional SMS. You get access to clean API documentation, sample code, and support to get your integration working quickly. Most developers are live within 30 minutes to an hour.
The Digimiles API works with any programming language – PHP, Python, Java, Node.js, .NET, Ruby, and others. Since it is a standard REST API, any language that can make an HTTP request can integrate with it. We provide sample code to help you get started faster.
The standard throughput is 5,000 SMS per second. With Digimiles, this can go up to 10,000 SMS per second depending on your requirement.
Digimiles transactional SMS starts at ₹0.275 per SMS and goes as low as 13 paisa depending on the volume. The entry plan is 5,000 SMS for ₹1,375 plus GST. There is no setup fee and your credits never expire – you pay only for what you use.
Yes. Just get in touch with us and we will set up a free trial account for you. You can test delivery speed, check reports, and try the API before you buy anything.
Yes. Digimiles offers both transactional and promotional SMS on separate routes. If you are still evaluating providers or want to compare plans, check out our guide on the best bulk SMS providers in India it compares top providers and helps you understand which routes and features each provider offers in detail.