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SMS remains an important communication channel for Indian businesses. From OTPs and payment alerts to order updates and promotional campaigns, companies use bulk SMS to reach customers at scale.
But choosing a bulk SMS service provider is not just about finding the lowest price per message. Delivery performance, DLT compliance, domestic routes, API quality and reporting capabilities all matter when messages are part of everyday business operations.
Whether you're a marketing team planning campaigns or a developer integrating transactional SMS into an application, the right provider should meet your communication requirements without making implementation and management unnecessarily complicated.
Here are 10 bulk SMS service providers in India worth evaluating in 2026.
The best bulk SMS provider in India is the one that matches your message types, volume and integrations. Compare DLT support, domestic routes, API quality, delivery reporting, pricing and support. This guide profiles ten providers, including Helo.ai, using published documentation rather than independent tests.
What types of bulk SMS can businesses send in India?
Indian operators treat promotional, transactional and service messages differently, so the category you choose decides which header, template and consent rules apply. TRAI's Telecom Commercial Communications Customer Preference Regulations, 2018 defines the categories below. TRAI has amended its rules since 2018, so check the current text before you register.
| Message type | TRAI definition in brief | Typical examples |
|---|---|---|
| Promotional | A commercial message sent where the sender has not taken explicit consent from the recipient | Offers, sale announcements, campaigns |
| Transactional | A message triggered by a transaction the subscriber performed with the sender, sent within thirty minutes of it and directly related to it | OTPs, payment confirmations, order confirmations |
| Service | A message sent with the recipient's consent or through a registered template to facilitate, complete or confirm a transaction, or to give warranty, recall, safety, security, account, subscription, delivery or employment notices | Delivery notices, account alerts, policy notices |
Registered content templates carry a prefix label of Transactional, Service or Promotional, and promotional messages must include information on how to revoke consent. Provider support for each category differs, so ask which categories and routes your provider offers.
Best bulk SMS service providers in India: Comparison
The following shortlist is based on publicly available product information and official documentation. It is not an independently tested ranking. Helo.ai is listed first, followed by other providers with published SMS offerings and documentation.
| Provider | Best suited for | Notable capabilities |
|---|---|---|
| Helo.ai | Enterprises seeking bulk SMS and omnichannel communication | Bulk messaging, scheduling, analytics, integrations and DLT assistance |
| Infobip | Large enterprises and international messaging | SMS APIs, delivery reports, global messaging and analytics |
| MSG91 | Developers and growing businesses | Bulk SMS API, templates, SMS logs and analytics |
| Gupshup | Enterprise messaging operations | SMS API, multilingual messaging and delivery reports |
| Exotel | Businesses combining SMS and cloud telephony | Static and dynamic bulk SMS, APIs and delivery webhooks |
| Twilio | Developers building international applications | Programmable SMS APIs and global messaging infrastructure |
| SpringEdge | India-focused SMS and API requirements | Promotional and transactional SMS, Unicode and delivery reports |
| Fast2SMS | Small businesses and self-service API users | Bulk SMS API, DLT templates and scheduling |
| 2Factor | Developers building OTP and application messaging | REST APIs, SDKs, testing resources and delivery webhooks |
| Kaleyra | Businesses managing high-volume and international messaging | Bulk SMS APIs, scheduling, Unicode and reporting |
The best provider for your business depends on your monthly volume, message categories, integration requirements, target markets and support expectations.
10 bulk SMS service providers in India
Each profile below summarises the provider's published product information. Helo.ai did not run delivery tests on any provider.
1. Helo.ai
BEST FOR: ENTERPRISE AND OMNICHANNEL MESSAGINGHelo.ai, by VivaConnect, offers enterprise SMS services for businesses that need to communicate with customers at scale.
Its SMS platform supports bulk messaging, promotional campaigns, transactional notifications and automated communication. Businesses can also explore SMS alongside other channels such as WhatsApp and RCS.
Key capabilities:
- Bulk SMS messaging.
- Automated campaign scheduling.
- Real-time analytics.
- Business system integrations.
- Compliance and DLT assistance.
- Multi-channel communication capabilities.
Why consider Helo.ai?
Helo.ai is worth evaluating if SMS is part of a broader customer communication strategy. Businesses can discuss their volume requirements, message categories, India routing arrangements and reporting needs with its team.
Explore: Helo.ai SMS
Product enquiry: Talk to the Helo.ai team through the SMS product page.
To see where Helo.ai SMS fits alongside other channels, read its guide to WhatsApp vs SMS notifications or browse the WhatsApp and RCS product pages.
2. Infobip
BEST FOR: LARGE ENTERPRISES AND GLOBAL MESSAGINGInfobip provides an enterprise communications platform with SMS APIs and tools for managing messaging across multiple channels.
Its SMS offering supports programmatic messaging, delivery reporting and integration with broader customer engagement workflows.
Key capabilities:
- SMS API for application-based messaging.
- Bulk messaging capabilities.
- Delivery reports and message-level logs.
- Reporting and analytics.
- Global messaging infrastructure.
Why consider Infobip?
Infobip is worth evaluating if your business operates across multiple markets or needs SMS to work alongside channels such as WhatsApp and other messaging services.
Explore: Infobip SMS documentation
3. MSG91
BEST FOR: DEVELOPERS AND GROWING BUSINESSESMSG91 offers SMS services through its platform and APIs. Its documentation covers sending individual and bulk messages, managing templates and retrieving messaging data.
Key capabilities:
- Single and bulk SMS API.
- SMS template management.
- Message logs.
- SMS analytics.
- Additional communication channels.
Why consider MSG91?
MSG91 is a practical option for businesses integrating SMS into websites, applications, CRM systems and automated workflows.
Explore: MSG91 SMS API documentation
4. Gupshup
BEST FOR: ENTERPRISE MESSAGING OPERATIONSGupshup provides enterprise SMS APIs that allow businesses to send messages programmatically to individual recipients, multiple recipients or groups.
Its developer documentation includes support for multilingual messaging, OTP generation and delivery reporting.
Key capabilities:
- Enterprise SMS API.
- Single and bulk messaging.
- Multilingual SMS.
- OTP generation.
- Real-time delivery reports.
Why consider Gupshup?
Gupshup may suit businesses looking for programmable messaging capabilities that can connect with broader customer engagement workflows.
Explore: Gupshup Enterprise SMS API
5. Exotel
BEST FOR: SMS AND CLOUD TELEPHONYExotel offers an SMS API for sending individual and bulk messages programmatically. Its documentation describes static and dynamic bulk messaging, delivery-status webhooks and India-specific DLT requirements.
Key capabilities:
- Single and bulk SMS API.
- Static and dynamic bulk messaging.
- Real-time delivery-status webhooks.
- DLT Entity ID, Template ID and sender ID support.
- Cloud communication integrations.
Why consider Exotel?
Exotel is worth evaluating if your business already uses, or plans to use, cloud telephony alongside SMS communication.
Explore: Exotel SMS API documentation
6. Twilio
BEST FOR: DEVELOPERS BUILDING GLOBAL APPLICATIONSTwilio offers programmable messaging APIs that developers can integrate into websites, applications and business systems.
Its international messaging infrastructure makes it relevant for companies communicating with customers across multiple countries.
Key capabilities:
- Programmable SMS APIs.
- International messaging.
- Application and system integrations.
- Message status tracking.
- Developer documentation.
Why consider Twilio?
Twilio may suit development teams building global applications where messaging across different markets is an important requirement.
India-specific consideration: International SMS capability does not automatically mean a provider's domestic India routes meet your requirements. Twilio documents separate India-specific arrangements, including DLT requirements for domestic messaging. Confirm route eligibility, sender details and support for your intended message category before choosing it.
Explore: Twilio India SMS guidelines
7. SpringEdge
BEST FOR: INDIA-FOCUSED SMS REQUIREMENTSSpringEdge provides SMS APIs for transactional, promotional and Unicode messaging. Its documentation also describes delivery reports and API-based message tracking.
Key capabilities:
- Transactional and promotional SMS.
- Unicode messaging.
- Delivery-status reporting.
- API and SMPP integration options.
- Message tracking.
Why consider SpringEdge?
SpringEdge is worth evaluating for India-focused SMS requirements, especially when the technical team needs API integration or an SMPP connection for higher-volume workloads.
Explore: SpringEdge SMS API
8. Fast2SMS
BEST FOR: SMALL BUSINESSES AND SELF-SERVICE API USERSFast2SMS provides an API for sending bulk SMS and other messaging types. Its documentation includes DLT SMS endpoints, scheduling, delivery reports and webhooks.
Key capabilities:
- Bulk SMS API.
- DLT template-based messaging.
- Delivery report APIs and webhooks.
- Scheduling options.
- Developer documentation.
Why consider Fast2SMS?
Fast2SMS may suit smaller teams that prefer a self-service setup and want to integrate SMS without a lengthy enterprise sales process.
India-specific consideration: Check the applicable DLT route and template requirements for the exact service you plan to use. Do not assume every sending option has identical compliance conditions.
Explore: Fast2SMS API documentation
9. 2Factor
BEST FOR: OTP AND APPLICATION MESSAGING2Factor provides REST APIs, SDKs and developer documentation for integrating SMS into applications. Its published offering includes delivery webhooks and testing resources.
Key capabilities:
- REST-based SMS APIs.
- SDKs for multiple programming languages.
- Delivery report webhooks.
- Testing and sandbox resources.
- OTP and bulk SMS services.
Why consider 2Factor?
2Factor is worth evaluating if your primary requirement is integrating OTP and application-triggered messaging into your product.
Explore: 2Factor Bulk SMS API
10. Kaleyra
BEST FOR: HIGH-VOLUME AND INTERNATIONAL MESSAGINGKaleyra provides SMS APIs for businesses that need to send promotional, transactional and OTP messages. Its documentation includes separate SMS capabilities for India and international markets.
Its bulk SMS API supports sending messages to multiple recipients in a single request, while its platform also offers scheduling, Unicode messaging and campaign reporting.
Key capabilities:
- Bulk SMS APIs.
- Promotional and transactional messaging.
- OTP messaging APIs.
- Unicode SMS.
- Scheduling and delivery reporting.
- Global messaging infrastructure.
Why consider Kaleyra?
Kaleyra is worth evaluating if your business needs API-based messaging and expects to manage communication across multiple markets.
Explore: Kaleyra SMS API documentation
Get a quote for bulk SMS from Helo.ai
Share your monthly volume, message categories and India routing needs, and the Helo.ai team can walk through its SMS options.
How to choose the right bulk SMS service provider
A provider's feature list may look impressive, but the right choice depends on how well it supports your actual messaging requirements.
Here are six factors to evaluate before signing up.
1. DLT compliance and registration support
In India, businesses sending bulk SMS must meet the applicable requirements under TRAI's Telecom Commercial Communications Customer Preference Regulations (TCCCPR), 2018.
The registration requirements include:
- Principal Entity (PE) registration.
- Sender header registration.
- Content template registration.
- Transmission of the required PE ID, header and Content ID.
- Consent template registration and customer consent acquisition, where applicable.
Ask whether the provider helps with DLT registration, template mapping, troubleshooting and message rejection issues.
Refer to TRAI's guidance for senders for the regulatory requirements.
The five DLT steps TRAI lists for senders
Source: TRAI advice to senders. Helo.ai offers DLT management support for registration and template mapping.
Links and templates: TRAI's direction of 20 August 2024 requires each content template to be linked to one header and bars traffic containing URLs, APKs, OTT links or call-back numbers that are not whitelisted, from 1 September 2024 (TRAI direction). Ask every provider how it handles URL whitelisting and template-header mapping.
2. India routes and delivery performance
Ask how messages are routed through Indian telecom operators and which domestic routes are available for your traffic.
Understand the provider's routing arrangements, escalation process and delivery-report handling.
Do not rely only on advertised delivery percentages. Test the service using your own message types, recipient networks and target audience.
3. API documentation and integration
If you're sending OTPs, alerts or application-triggered messages, API quality matters.
Look for:
- Clear API documentation.
- Secure authentication and access controls.
- SDKs and code examples.
- Delivery-status webhooks.
- Error codes and retry guidance.
- Support for your expected message volume.
A well-documented API can reduce integration time and make troubleshooting easier.
For an overview of how these APIs work, read Helo.ai's guide to how an OTP API works.
4. Delivery reports and analytics
A message being accepted by an API does not necessarily mean it reached the recipient.
Check whether the provider offers:
- Message-level delivery status.
- Failure and error information.
- Campaign-level reports.
- Webhooks for delivery updates.
- API access to reporting data.
Also ask how the provider defines its delivery statuses. A network delivery receipt is not proof that the customer read the message.
Delivery speed matters as much as delivery status. See Helo.ai's glossary entry on SMS latency and its guide to SMS OTP delivery time.
5. Pricing and message segmentation
Compare pricing at your expected monthly volume rather than relying on the smallest advertised plan.
Ask whether the quote includes platform fees, setup costs, taxes, minimum commitments and support charges.
Also understand how Unicode messages and longer SMS messages are billed. Different character encodings can change how many message segments are generated, affecting your total cost.
6. Customer and technical support
Support becomes especially important when OTPs, payment alerts or order notifications are delayed.
Check support hours, escalation procedures, integration assistance and the availability of a dedicated account manager for enterprise requirements.
How bulk SMS pricing works in India
This guide does not quote per-SMS rates, because rates change with volume, route and message type, and providers include different items in a quote. Use the formula below to compare quotes on the same basis.
Estimated monthly cost
Messages x segments per message x rate per segment + platform and setup fees + taxesThe segment count depends on message length and character encoding. Standard SMS encodings set the limits: a single GSM-7 segment holds 160 characters and a single UCS-2 segment holds 70. Once a message is split into several segments, each holds 153 characters in GSM-7 or 67 in UCS-2. Providers may bill per segment or in other ways, so confirm how yours counts.
Characters in a single SMS segment, by encoding
| Encoding | Single segment | Each segment when split | Maximum length |
|---|---|---|---|
| GSM-7 | 160 characters | 153 characters | 1,600 characters |
| UCS-2 | 70 characters | 67 characters | 700 characters |
Worked example: a 200-character English message in GSM-7 needs two segments, because it exceeds 160 characters and each split segment holds 153. A 100-character message in UCS-2 also needs two, because it exceeds 70 and each split segment holds 67. At 100,000 recipients, two segments per message means 200,000 billed segments if your provider bills per segment.
What to ask before you accept a quote
- Does the rate cover DLT scrubbing, platform fees, setup and support, or are they extra?
- Is GST or any other tax added on top of the quote?
- How are Unicode and multi-segment messages billed?
- Do transactional, promotional and OTP traffic have different rates or routes?
- Are there minimum commitments, credit expiry rules or overage rates?
How to run a bulk SMS provider pilot
Send the same test messages through each shortlisted provider, on the same operators and at the same time of day, then compare the results below.
| Measure | How to calculate it | What it tells you |
|---|---|---|
| Acceptance rate | Messages accepted by the API divided by messages submitted | Integration quality and template or header errors |
| Delivery rate by operator | Delivered messages divided by accepted messages, per operator | Route quality on the networks your customers use |
| Delivery time, p50 and p95 | Median and 95th percentile time from request to delivery report | Speed for time-sensitive messages such as OTPs |
| Rejections by reason | Count of rejected messages grouped by error code | DLT, template and header mismatches |
| Cost per delivered message | Total spend divided by delivered messages | The real cost after failures and segments |
Run the same test messages across shortlisted providers wherever possible. Compare delivery outcomes, API behaviour, reporting quality, support and total cost.
Common mistakes when choosing a bulk SMS provider
Most problems after launch trace back to a few avoidable choices.
- Choosing on price alone: A low rate can hide platform fees, setup costs, segment billing or poor routes.
- Treating DLT as an afterthought: Header and template mismatches cause rejections, so check registration support before you sign.
- Mixing message categories: Promotional, transactional and service messages follow different rules and should not share a template or route.
- Trusting advertised delivery rates: Test with your own messages, operators and audience instead.
- Ignoring link rules: Messages with URLs that are not whitelisted can be blocked in India.
- Skipping peak-load planning: Ask how the provider handles sales events and OTP spikes.
- Having no fallback: For critical messages, decide in advance what happens if SMS is delayed.
Which bulk SMS provider should you choose?
There is no single provider that is automatically the best for every business. Use your requirements to narrow the shortlist.
| Your requirement | Providers worth evaluating |
|---|---|
| Enterprise and omnichannel messaging | Helo.ai, Infobip |
| Developer-led SMS integrations | MSG91, Gupshup, Twilio |
| SMS with cloud telephony | Exotel |
| India-focused API and SMPP requirements | SpringEdge |
| Self-service and smaller-scale requirements | Fast2SMS, 2Factor |
| High-volume and international messaging | Kaleyra, Infobip |
These are starting points for evaluation, not performance rankings. Compare the providers against the same requirements before making a decision.
A practical checklist before choosing
Before finalising a provider, ask for:
- A quote based on your expected monthly message volume.
- Confirmation of India-specific DLT and route support.
- API documentation and integration assistance.
- Sample delivery reports and error responses.
- A test account or controlled pilot, where available.
- Support and escalation details.
Why businesses evaluate Helo.ai for bulk SMS
Helo.ai, by VivaConnect, combines bulk SMS with WhatsApp, RCS, voice and email, so teams can run several channels from one provider. The table below summarises what its SMS product page describes.
| If you need | What Helo.ai SMS offers |
|---|---|
| Scheduled and behaviour-based campaigns | Messages triggered by customer behaviour, time zones or set schedules |
| Delivery visibility | Real-time monitoring of message delivery and customer interactions |
| Connection to business systems | Integrations with core banking systems, CRMs, ERP, SAP, e-commerce platforms and helpdesks |
| Compliance support | TRAI regulation support, including DLT registration and template checks |
| More than one channel | SMS alongside WhatsApp, RCS, voice and email |
Retail and e-commerce teams can also read about Helo.ai's retail and e-commerce solutions, or use its DLT management service to handle registration. Feature availability depends on your setup and market, so confirm details with the Helo.ai team.
When SMS alone is not enough
SMS has broad mobile reach, but it is text only. If you want images, buttons or two-way conversations, consider pairing it with other channels. Helo.ai's product pages cover WhatsApp and RCS, and its guide to RCS Business Messaging for e-commerce and retail explains how RCS compares with SMS.
Frequently asked questions
What is a bulk SMS service provider?
A bulk SMS service provider enables businesses to send large volumes of text messages through a web platform or API. Common uses include promotional campaigns, OTPs, payment alerts, order updates and service notifications.
Which is the best bulk SMS service provider in India?
The best provider depends on your requirements. Enterprises may prioritise DLT assistance, domestic routes, reporting and support, while developers may focus on API documentation, webhooks and integration flexibility.
Is DLT registration mandatory for bulk SMS in India?
Businesses sending bulk communication in India must meet the applicable TRAI requirements. These include Principal Entity registration, sender header and content template registration, and consent-related requirements where applicable.
What is the difference between promotional and transactional SMS?
Promotional SMS is used for marketing communication such as offers and campaigns. Transactional and service messages relate to specific transactions, services or permitted notifications. The applicable category, registration and consent conditions must be followed.
Can I send bulk SMS through an API?
Yes. Most business SMS providers offer APIs that allow applications, websites, CRMs and other systems to send messages programmatically. Many also provide delivery-status webhooks and reporting endpoints.
How do I check whether an SMS has been delivered?
Providers typically offer delivery reports through dashboards, APIs or webhooks. These reports show the status returned by the messaging network. Check the provider's status definitions and reporting limitations before treating a delivery report as proof that a customer read the message.
How much does bulk SMS cost in India?
The cost depends on message volume, message type, route, character encoding and what the quote includes. Estimate it as messages x segments per message x rate per segment, plus platform fees and taxes, and compare quotes on the same basis.
How many characters are in one SMS segment?
A single GSM-7 segment holds 160 characters and a single UCS-2 segment holds 70. When a message is split, each segment holds 153 and 67 characters respectively. Longer or regional-language messages can use more segments.
Can I include links in bulk SMS in India?
TRAI's direction of 20 August 2024 bars traffic containing URLs, APKs, OTT links or call-back numbers that are not whitelisted, from 1 September 2024. Check URL rules with your provider before you send.
What bulk SMS capabilities does Helo.ai offer?
According to its SMS product page, Helo.ai offers bulk and automated SMS campaigns, scheduling, real-time delivery monitoring, integrations with business systems and TRAI and DLT compliance support. It also offers WhatsApp, RCS, voice and email.
Final thoughts
Choosing a bulk SMS service provider is a decision that affects customer communication, application workflows and everyday business operations.
Look beyond per-message pricing. Evaluate DLT support, domestic routes, API capabilities, delivery reporting and technical assistance.
Most importantly, test the service against your actual requirements before committing. The right provider should make it easier to send compliant messages, monitor delivery and manage communication as your business grows.
Talk to Helo.ai about your SMS requirements
Share your volumes, message categories and reporting needs, and the Helo.ai team can walk through bulk SMS, DLT support and other channels.
Disclaimer. This article is general information, not legal, regulatory, compliance or purchasing advice. Provider features, documentation, prices and TRAI rules change, so confirm current details with each provider and consult qualified advisers. The shortlist is based on published product information and documentation read in November 2026, not independent testing or a ranking. Helo.ai is the publisher and is listed among the providers.
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