How Bulk SMS works?

Bulk SMS is the process of sending large number of SMS to different groups of people at different locations. They can be used to convey important information or used for promotional purposes. It is a very effective tool as SMS has 98% open rate and is read within 5 minutes of delivery.

Note: Bulk SMS can be used for communicating with your clients, customers, and transmitting vital information to them. You cannot use Bulk SMS platform for sending personal messages. 




How to send Bulk SMS?



1. Select the route 

Select the route through which you want to send bulk SMS. There are 3 routes for sending bulk SMS:

  • Promotional – In this route promotional SMS are sent to non DND numbers within the time frame of 9 AM to 9 PM only. If you are sending SMS after 9 PM, then automatically the SMS is scheduled for the next day morning 9 AM.
  • Quick Transactional – This route is newly launched by Fast2SMS. In this route you have to get each SMS template  approved by us. After that you can send the approved SMS templates to non DND and DND numbers. SMS should not be  promotional. Here you don’t need to submit document for verification. Click here to know in detail about Quick Transactional route.
  • Transactional  – In this route you have to submit documents for verification and after verification gets completed you can send SMS to non DND and DND numbers. The SMS should be of non promotional nature. In this route approval of each SMS template is not required. Once the transactional route is approved in your Fast2SMS account then you can send any number of SMS at any time. You don’t need our approval for sending transactional SMS. Once your documents are verified, transactional route will be approved in your Fast2SMS account. If you want to get transactional SMS  approval, email us at [email protected]

Bulk SMS working



2. Select the Sender ID

You can use default sender ID of Fast2SMS that is FSTSMS or create your own Sender ID. Click on Add New button on the right side to create your own sender ID. If you want to renew your Sender ID click on Renew option next to Add New button. Click here to know more in detail about Sender ID.

Sender ID add in Bulk SMS

Once you click on the ADD NEW button, the following screen will show up on the screen. Click on the I AGREE TERMS & CONDITIONS button to proceed further with creating sender ID.

Sender ID terms and Conditions


3. Now enter the mobile number

You can select the CONTACT button to enter one mobile number like shown below.

Mobile number add in Bulk SMS

If you wish to add more mobile numbers then select the LIST button. In the image below, we have entered 4 mobile numbers.

Contacts in list

At the right side of the screen, there are more options given for adding contacts like Contact, Group, QR Group. There is an Address Book button above all these 3 options. When you click on the Address Book button, you will find many ways to add contacts like Upload CSV, Add contacts, Add multiple contacts, you can even create a group of your contacts. If you want to know the complete details of adding contacts click here.

Bulk SMS contacts


4. Now type the message in the message box

If you wish to hide your mobile number, click on Hide Mobile No. Type your message in the message box. By default English tab is selected, if you wish to send message in language other than English, select the Unicode tab. Once you have written the message in roman, press space. Automatically it will convert it in the language you wish to send the SMS.

Unicode SMS

Here we have selected Hindi language. Once we have written the message and press space, it gets converted into Hindi as shown below.

Unicode message

You can also drag and drop the SMS from the previously sent messages and saved messages. If you want to send the same SMS again which you have sent earlier, simply you can drag the message from the Previous Messages option and drop it to your message box like described below. As shown in the image below, we have selected a saved message “Hello, how are you?” and dragged and dropped it into the message box.

Drag and Drop

After dropping that message in the message box, it will appear as shown below. Now the message is ready to be sent.

Save after drag and drop


5. Send the SMS

After you have written your message press send. You can send Flash SMS by clicking on the icon next to schedule button. Flash SMS appears automatically on the receiver’s mobile screen without any user interaction. Click here to know in detail about Flash SMS.

When you click on the icon highlighted with red color, flash will get enabled. Now you can send Flash SMS. At the top of the screen message will be displayed that Flash SMS is enabled. To disable Flash SMS click on that icon again.

Flash SMS


This is how Bulk SMS works.


Note : If you are sending Bulk SMS from promotional route after 9 PM, then a warning message will be displayed. As per TRAI rules, promotional SMS is not allowed from 9 PM to 9 AM. Your SMS will be automatically scheduled for the next day at 9 AM. The warning message will be displayed as shown in the image below.

How bulk SMS works?



Bulk SMS Example

Below is an example of how to send bulk SMS. In the below example, we have first selected the sender ID, then entered the mobile number. After that typed the message.

Bulk SMS Example


  •  When we press the send button, a confirm dialog box will appear. Confirm dialog box will have all the details regarding your SMS. It will give a preview on how your message will look like when it gets delivered on the mobile phone. It will describe details like cost per SMS, total characters, total numbers, etc. Click on the confirm box to sent the message.

Promotional Bulk SMS example

There is a character limit for each SMS. It is different for Unicode and for English SMS.

Note – Your SMS can only include 1530 characters in total, not more than that.

Below is a list of how many characters will be counted as 1 SMS, 2 SMS, 3 SMS and so on. It describes about the character limit of SMS in English language.

Character limit of SMS

SMS Length( No of characters)SMS Count

Below is a character limit for Unicode SMS

SMS Length (No of characters)SMS Count

Note – Amount will be calculated based on the SMS count. Suppose there are 165 characters in your SMS. Then cost of 2 SMS will be deducted from your Fast2SMS wallet.

  • A message will be displayed that your SMS is successfully sent.


  •  The message will appear in the receiver’s mobile as shown below

how bulk SMS works?


  •  You can activate premium membership to hide your mobile number. If you have activated premium membership, then your mobile number will not be shown in the SMS. In the below image mobile number is not displayed as they have subscribed to premium membership.

Note: This feature will only work in bulk SMS, it will not work in free SMS.

how bulk SMS works?


  •  Check delivery report after some time. To see delivery report of the SMS which you have sent, click on the Delivery Reports option on the left side. All your sent SMS will appear here. Click on the message to open it and view its status. To know more about Delivery Reports, click here.

You can even schedule the SMS to be sent at a later date. To schedule the SMS, click on SCHEDULE, then select the Date. You can select multiple dates as well for sending the SMS at multiple times on the future dates. If you want to schedule the SMS for one time then select ONE TIME else select MULTIPLE.

Below we have described about scheduling SMS on multiple dates. In this example we have scheduled our SMS for the dates 15th, 16th and 17th July and set the time as 2 PM. After selecting the required date and time, click on the SCHEDULE button. The message gets scheduled for that particular date and time.

So if you want, you can schedule the SMS or send the SMS instantly by pressing the send button.

Schedule SMS


When you click on the Schedule button, following screen will pop up. Click on Confirm.

how bulk SMS works?

As soon as you press confirm, the following message will appear on your screen.

Message scheduled successfully


If you want to cancel the scheduled SMS you can do it by going to the delivery report section and then select the schedule tab and then click on the Cancel SMS option. Money charged for that SMS will be refunded in your Fast2SMS wallet. It is described in the image below.

Cancel scheduled SMS


How bulk SMS works?

Select Yes Cancel button. Once you select it, a dialog box will appear stating that schedule bulk SMS has been canceled successfully.

Schedule SMS cancelled



If suppose you have scheduled a promotional message to be sent after 9 PM, then a warning is displayed as shown in the image below. As per TRAI, you are not allowed to send promotional message from 9 PM to 9 AM. Your SMS will be scheduled automatically at 9 AM(next morning). Press Schedule SMS if you want to send the SMS.

How bulk SMS works?

If you want to cancel the scheduled SMS, you can do it so by visiting the Delivery report section, then select the schedule tab and then click on the Cancel SMS option. Money charged for that SMS will be refunded in your Fast2SMS wallet.


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