Bulk SMS Messaging: What It Is, How It Works and How Businesses Use It

Imagine you have 10,000 customers and need to tell all of them about an important update.

Calling every customer would take days. Sending individual SMS messages would take just as long.

This is where bulk SMS messaging comes in.

Bulk SMS messaging allows businesses to send SMS messages to a large number of customers through a messaging platform instead of sending every message manually. Businesses can use it for promotions, customer updates, reminders, alerts, OTPs, and other important communication.

But how does bulk SMS actually work? What types of messages can businesses send? And if you are sending bulk SMS in India, what does DLT have to do with it?

Let’s understand it step by step.

What Is Bulk SMS Messaging?

Bulk SMS messaging is the process of sending SMS messages to a large group of recipients at the same time using an SMS platform or service.

For example, an online store may want to inform 20,000 customers about a new sale.

Instead of sending the message to each customer separately, the business can upload or select its customer list, create the SMS, and send it through a bulk SMS platform.

The customers receive the message individually on their mobile phones.

A business can use bulk SMS messaging for things like:

• Promotional offers
• Order updates
• Appointment reminders
• Payment reminders
• OTPs
• Delivery notifications
• Event updates
• Service alerts
• Customer notifications

The exact type of message a business can send depends on the applicable telecom and messaging rules.

How Does Bulk SMS Messaging Work?

The process is simpler than it may sound.

A typical bulk SMS campaign works like this:

Business → SMS platform → Telecom network → Customer’s mobile phone

1. Prepare your customer list

First, the business needs a list of customers or users it is permitted to contact.

This could be a list of existing customers, subscribers, members, or users who have provided the required consent where applicable.

2. Create the SMS

The business creates the message it wants to send.

For example:

ABC Store: Your order #4582 has been shipped. Track your delivery here: [Link]

For business SMS in India, the message also needs to follow the applicable DLT content-template requirements.

3. Send the campaign through an SMS platform

The business selects its recipients and sends the campaign through its bulk SMS platform.

The platform passes the message into the relevant telecom messaging ecosystem.

4. Message reaches the customer

The SMS is delivered to the customer’s mobile number through the telecom network.

The customer does not need to install a separate app just to receive an SMS.

5. Delivery can be tracked

Depending on the SMS platform, businesses can see information about submitted and delivered messages and other campaign details.

This helps businesses understand whether their messages are reaching customers successfully.

What Types of Bulk SMS Can Businesses Send?

Bulk SMS isn’t limited to promotional messages.

Businesses commonly use SMS for several different purposes.

1. Promotional SMS

These messages are used to promote products, services, offers, discounts, or campaigns.

For example:

ABC Fashion: Get 20% off on selected products this weekend. Shop now: [Link]

Promotional messaging is subject to applicable regulatory requirements, including customer preference and consent rules.

2. Transactional and Service Messages

These messages provide information related to a customer’s transaction or service.

For example:

Your order #4582 has been confirmed and will be shipped shortly.

Other examples include payment updates, booking confirmations, and service-related notifications.

3. OTP Messages

OTP SMS messages are used to verify a customer’s identity or action.

For example:

Your verification code is 482913. Please do not share this code with anyone.

These messages are commonly used for account login, registration, payment verification, and other authentication processes.

4. Alerts and Notifications

Businesses can also use SMS to send important alerts.

For example:

Your appointment with ABC Clinic is scheduled for 10 September at 4:00 PM.

Banks, hospitals, schools, e-commerce businesses, service providers, and other organizations can use SMS notifications for different customer updates.

How Do Businesses Use Bulk SMS Messaging?

The biggest advantage of bulk SMS messaging is that it can be used at different stages of the customer journey.

1. Marketing

A retail business can send information about a new product, sale, or promotional campaign to its eligible customer audience.

2. Order Updates

An e-commerce company can send order confirmations, shipping updates, and delivery notifications.

3. Appointment Reminders

Hospitals, clinics, salons, consultants, and other appointment-based businesses can send reminders to customers.

4. Payment Reminders

Businesses can use SMS to remind customers about upcoming or overdue payments, subject to applicable communication rules.

5. Education

Schools, colleges, coaching institutes, and training centers can use SMS for important announcements, schedules, reminders, and other updates.

6. Customer Alerts

Businesses can send service notifications when something important changes.

For example, a company can notify customers about a service interruption, booking change, or other time-sensitive update.

The important point is that bulk SMS messaging is not only a marketing tool. It can also be used for routine customer communication.

How to Send Bulk SMS?

Sending a bulk SMS campaign generally involves a few basic steps.

Step 1: Choose an SMS platform

Choose a bulk SMS platform that supports the type of messaging your business needs.

Step 2: Complete the required registration

For commercial communication in India, businesses need to follow the applicable DLT requirements.

This includes registering the business as a Principal Entity and completing the required header and content-template registration. TRAI’s guidance specifically lists Principal Entity registration, header assignment, content-template registration, and consent-related requirements where applicable.

Step 3: Register your SMS header

A header is the sender identifier associated with your business SMS.

TRAI maintains a compiled list of SMS headers for commercial communication.

Step 4: Register your SMS content template

The message content used for applicable commercial communication needs to follow the registered content-template framework.

This is important because businesses cannot simply create completely different content and assume that it will be treated as the same approved message.

TRAI has also issued directions concerning the misuse of headers and content templates.

Step 5: Add your recipients

Once the messaging setup is ready, add or select the customers you want to reach.

Step 6: Send the SMS

Create the campaign, review the message, and send it through the SMS platform.

Step 7: Check delivery

After sending, review the available delivery information to understand how the campaign performed.

Is DLT Registration Required for Bulk SMS in India?

If you are a business sending commercial communication through SMS in India, DLT compliance is an important part of the process.

DLT stands for Distributed Ledger Technology.

For commercial communication, TRAI’s guidance requires senders to complete the applicable registration and message-related requirements. These include Principal Entity registration, registered headers, registered content templates, and consent-related requirements where applicable.

In simple terms, a business cannot treat commercial bulk SMS like sending a personal text message from a mobile phone.

There is a regulated process behind business SMS.

What needs to be registered?

The main components include:

Business/entity: The business registers as a Principal Entity.

Header: The sender identifier used for commercial SMS needs to be registered.

Content template: The structure of the SMS needs to be registered.

Consent: Where required, the business needs to follow the applicable consent requirements.

TRAI’s current guidance states that failing to complete the required steps will not allow commercial communication to be sent.

Why Does the SMS Need to Match the Approved Template?

This is one of the most important things to understand about bulk SMS in India.

Suppose your registered template is:

ABC Store: Your order {{Order ID}} has been shipped. Track it here: {{Link}}

Here, the order ID and link are variable information.

The actual message should follow the registered template structure and applicable DLT rules.

You should not assume that you can take the same approved template and completely change its fixed content for a different purpose.

TRAI has issued directions specifically addressing the misuse of headers and content templates, and it has also introduced measures around the handling of variables in SMS content templates.

This is why businesses should prepare the SMS templates they actually plan to use before starting large-scale messaging.

How CallerDesk Helps With Bulk SMS Messaging

Businesses that want to send bulk SMS can use a dedicated messaging platform instead of managing every message manually.

CallerDesk provides a business communication platform that includes bulk SMS along with other communication solutions. Its documentation also lists the ability to send bulk SMS from the platform.

With a bulk SMS panel, businesses can manage their SMS communication from one place rather than sending messages individually.

For example, a business could use SMS for:

• Promotional campaigns
• Customer updates
• Appointment reminders
• Payment-related communication
• Other approved business messages

The important part is to complete the required DLT setup and use the appropriate approved messaging templates before sending applicable commercial SMS.

Conclusion

Bulk SMS messaging gives businesses a simple way to communicate with a large customer audience without sending messages one by one.

It can be used for marketing, OTPs, reminders, order updates, alerts, and other customer communication.

But sending bulk SMS in India is not simply about uploading a list of phone numbers and clicking Send. Businesses sending commercial communication need to follow the applicable DLT requirements, including registration, headers, content templates, and consent requirements where applicable.

Once the compliance side is properly handled, a bulk SMS platform can make the actual process much easier.

For businesses using CallerDesk, bulk SMS can also be managed alongside other business communication tools, giving teams one platform for more of their customer communication needs.