Bulk SMS Service Provider in India

The complete guide

Bulk SMS Service Provider in India: everything you need to know

What is a bulk SMS service provider in India?

Short answer: A bulk SMS service provider in India lets a business send one message to many mobile numbers through a registered sender ID, under TRAI rules. The entity, six-character header and every template must be registered on a DLT platform first. Com.Bot offers DLT-compliant SMS in India as a one-way channel inside its wider platform.

A bulk SMS service provider in India lets a business send one message to many mobile numbers at once through a registered sender ID. In India this runs under TRAI rules, which means the business entity, the six-character header and every message template must be registered on a DLT platform before the first send. Com.Bot handles this as a DLT-compliant SMS channel inside its wider communication platform.

Com.Bot SMS is one-way. The business sends, and customers cannot reply to the SMS. There are no keyword replies and no SMS inbox. When you want a response, you include a link, a phone number or a wa.me WhatsApp link in the message so the customer can continue the conversation on a channel that supports it.

That design keeps SMS simple and reliable for alerts and campaigns. It also means SMS works best as a notification and reach channel, while WhatsApp, Instagram, Messenger, Google RCS and the website chat widget handle two-way conversations in the same Com.Bot account.

Why send bulk SMS in India on Com.Bot?

Short answer: Bulk SMS in India on Com.Bot reaches customers on any phone without an app or data connection, which suits OTPs, payment reminders and delivery updates. Com.Bot adds SMS to a platform already running WhatsApp, Instagram, Messenger, Google RCS and web chat, so contacts, templates and campaigns stay in one place. Plans have no monthly conversation cap.

SMS reaches customers on any phone without an app, a data connection or a smartphone. For OTPs, payment reminders and delivery updates, that reach matters. Com.Bot adds SMS to a platform that already runs WhatsApp, Instagram, Messenger, Google RCS and web chat, so your team manages contacts, templates and campaigns in one place instead of juggling separate tools.

Com.Bot is an official Meta Business Partner with direct WhatsApp Business API integration, and more than 50,000 active customers, 100+ government bodies and 500+ global partners use the platform. SMS in India is one more channel you can switch on for the same contact list, with DLT registration handled as part of onboarding.

Because SMS is a separate campaign channel, you decide when to use it. You can send a promotional SMS to non-DND numbers, follow up with a WhatsApp template to opted-in contacts, or use RCS for a rich branded message on supported Android phones.

• One-way SMS with links, phone numbers or wa.me links for responses
• DLT entity, header and template registration support
• Promotional, transactional or service, and OTP message categories
• Shared contact lists with WhatsApp, RCS and other channels
• Works for D2C brands, agencies, coaching institutes and service businesses
• No monthly conversation cap on Com.Bot plans

How do you set up bulk SMS in Com.Bot?

Short answer: Setting up bulk SMS in Com.Bot starts with DLT registration: register your business entity, a six-character header and every template, using {#var#} variables. Then add SMS as a channel in Com.Bot, import or sync contacts, pick the category, and send a campaign or trigger SMS from the automation builder. Start at https://v3.com.bot/register.

Setup starts with DLT registration. You register your business entity, choose a six-character sender ID or header such as LUMASK, and get every message template approved on a DLT platform. Templates use {#var#} variables for the parts that change, like a name, order number or amount. Once approved, the same templates are available in Com.Bot.

Inside Com.Bot you add SMS as a channel, import or sync your contacts, and build your message from an approved template. You pick the category, promotional, transactional or service, or OTP, and the platform applies the matching DND and timing rules. Promotional SMS goes only to numbers not on the DND registry and within TRAI-permitted hours. Service and OTP messages can go to all numbers.

From there you can send a one-time campaign or trigger SMS from the automation builder. The same builder connects to 1,000+ integrations, bot triggers and external actions such as API calls and webhooks, so an order event in your store can fire a transactional SMS without manual work. Plans are billed quarterly, and you can start at https://v3.com.bot/register.

• Register the entity, six-character header and templates on DLT
• Add SMS as a channel in your Com.Bot account
• Import contacts or sync them from your CRM
• Choose promotional, service or OTP for each send
• Send a one-time campaign or trigger SMS from automations
• Track delivery and responses that arrive on other channels

DLT, DND and TRAI rules for bulk SMS in India

Short answer: DLT registration is mandatory for bulk SMS in India: the business entity, six-character sender ID and every template are registered before sending, each filed as promotional, transactional or service, or OTP. Promotional SMS goes only to non-DND numbers within TRAI-permitted hours, while service and OTP messages reach all numbers. Com.Bot offers SMS only in India.

DLT registration is mandatory. The business entity, the sender ID and every template are registered before sending. Headers are six characters, for example LUMASK, and templates use {#var#} variables. Each template is filed under a category: promotional, transactional or service, or OTP. Sending an unregistered template or a mismatched category can get the message blocked.

DND rules apply to promotional SMS. Promotional messages go only to numbers not on the DND or NCPR registry, and only within TRAI-permitted hours. Service and OTP messages go to all numbers because they relate to a transaction or a login the customer already started. This is why a cart reminder or an offer is promotional, while an order confirmation or a delivery update is service.

SMS in India is plain text with 160 GSM characters per segment. Longer messages split into multiple segments. Com.Bot offers SMS only in India and keeps the channel fully DLT compliant. Message charges for SMS are billed separately from your plan, and your Com.Bot team can share current rates on request.

• Entity, six-character header and templates registered on DLT
• Templates use {#var#} variables for dynamic content
• Promotional SMS only to non-DND numbers, within TRAI hours
• Service and OTP messages can reach all numbers
• 160 GSM characters per SMS segment
• SMS is available in India only

Bulk SMS use cases: marketing, alerts, OTP and reminders

Short answer: Bulk SMS in India covers promotional campaigns to non-DND numbers, transactional and service alerts like order, shipping and appointment updates, and OTP passcodes for logins. Because Com.Bot SMS is one-way, messages that need a response include a link, phone number or wa.me WhatsApp link. SMS runs alongside WhatsApp and Google RCS in one Com.Bot inbox.

Bulk marketing SMS works for launches, festive offers, sale announcements and re-engagement, sent to non-DND numbers within permitted hours. A skincare brand might announce a new range, or a coaching institute might promote a new batch. Because SMS is one-way, each message carries a link or a wa.me WhatsApp link so interested customers can act or ask questions.

Transactional and service SMS covers order confirmations, shipping and delivery updates, payment due notices for an existing order, appointment confirmations and reminders, and COD confirmations. These messages relate to something the customer already started, so they can reach all numbers and are not limited by DND.

OTP SMS delivers one-time passcodes for logins and verifications. Authentication templates are used only for passcodes. Many businesses run SMS next to WhatsApp and Google RCS: WhatsApp for opted-in conversations and rich replies, RCS for branded rich messages on supported Android phones, and SMS for broad, app-free reach. Com.Bot keeps all of them in one inbox and one contact list.

• Promotional campaigns to non-DND numbers
• Order and delivery notifications
• Payment reminders for existing orders
• Appointment confirmations and reminders
• One-time passcodes for logins
• SMS as a separate channel next to WhatsApp and RCS

SMS vs WhatsApp vs RCS: which channel should you pick?

Short answer: Pick SMS for app-free, one-way plain-text alerts, OTPs and broad campaigns, adding a link or wa.me link when you want a reply. Pick WhatsApp for two-way conversations, rich media, payments and commerce with opted-in contacts. Pick Google RCS for branded rich messages on supported Android phones. Com.Bot runs all three from one inbox.

Pick SMS when you need app-free reach, a plain-text alert or an OTP, and when the customer does not need to reply inside the same thread. It is a strong fit for delivery updates, payment reminders and promotional pushes to non-DND numbers. Responses come back through a link, a phone number or a wa.me WhatsApp link you include in the message.

Pick WhatsApp when you want a two-way conversation, rich media, buttons, payments or commerce. Business-initiated WhatsApp messages need Meta-approved templates and opted-in contacts, and a customer reply opens a 24-hour service window for free-form chat. Pick Google RCS when you want a branded sender with a logo and verified badge, images, carousels and suggested replies on supported Android phones.

Many teams use all three. A D2C brand might send an OTP by SMS, an order update by WhatsApp and a festive campaign by SMS to non-DND numbers, then handle replies in the Com.Bot shared inbox.

• SMS: app-free, one-way, plain text, links for responses
• WhatsApp: two-way, rich media, templates, commerce and payments
• RCS: branded rich messages on supported Android phones
• Use SMS for OTPs, alerts and broad campaigns
• Use WhatsApp for conversations and transactions
• Run all channels from one Com.Bot inbox

Bulk SMS mistakes to avoid and how to measure results

Short answer: The biggest bulk SMS mistakes in India are mismatching template categories, skipping DLT registration, sending promotional SMS to DND numbers or outside TRAI hours, and treating SMS as two-way when it is one-way. Measure delivery, link clicks and follow-up conversations on WhatsApp or your website. Com.Bot plans are billed quarterly and message charges are billed separately.

The most common mistake is sending promotional content through a service or OTP template, or the reverse. Category mismatches get messages blocked and can hurt your sender reputation. Another is skipping DLT registration or using an unregistered header. Sending promotional SMS to DND numbers or outside TRAI hours is also a quick way to lose deliverability.

Treating SMS as a two-way channel is another error. Customers cannot reply to the SMS, so every message that needs a response must include a link, a phone number or a wa.me WhatsApp link. Also avoid sending the same campaign on every channel at once without a reason.

To measure results, track delivery, link clicks and the conversations that start on WhatsApp or your website after an SMS. Compare campaigns by category and audience, and keep templates specific so you can see what works. Com.Bot plans are billed quarterly and message charges are billed separately, so ask the team for current SMS rates when you plan a campaign.

• Match the template category to the message content
• Complete DLT registration before the first send
• Keep promotional SMS to non-DND numbers in TRAI hours
• Include a link or wa.me link when you want a response
• Track delivery, clicks and follow-up conversations
• Ask the Com.Bot team for current SMS rates

Frequently asked questions