SMS Broadcasts enables you to deliver large-scale, personalised messages. It supports scheduling, launching, and tracking one-way campaigns, with features such as templates, file uploads, and delivery monitoring.
# How it works

Accessible via the Naxai web interface, SMS Broadcasts allows you to send messages to predefined recipients, uploaded contact lists, or targeted audience segments. SMS Broadcasts module allows you to: * Set up a one-way campaign using a step-by-step interface. * Upload and send messages to recipients from a file. * Use templates to speed up message creation. * Personalize messages with placeholders and attributes from Contacts. * Schedule messages and define delivery windows using Calendars. * Monitor delivery and performance through built-in analytics. * Spread messages over a period of time.
# Create New SMS Broadcast Log in to the Naxai web interface, navigate to SMS, then SMS Broadcasts, and select the source of recipients to use. You can add recipients from People, or use an existing file. To upload a file, please refer to the File requirements below. When uploading a file, you must provide the column containing the phone number. Provide a name for the SMS broadcast, select a Sender Service (don't forget to use a Sender Service for Marketing if you create a Marketing action), and type your message. When using a file, ensure it meets the requirements outlined below. You can use the personalization with Liquid syntax to create personalized messages. A preview of the first three messages is shown on the right panel. When using personalisation, the size of the messages (and the number of SMS parts) is estimated, see the [Character Support](https://docs.naxai.com/docs/character-support) section
SMS Broadcast creation form in the Naxai web interface

SMS Broadcast creation form in the Naxai web interface

## Advanced options Some advanced options are available to : * Send the SMS broadcast in a specific time window * Limit the number of SMS parts (to limit the cost) * When the SMS content exceeds the accepted number of parts, the SMS will receive the delivery status [802-message-parts-exceeded](https://docs.naxai.com/docs/status-error-codes#rejected) * Deduplicate the recipients when using a file * Spread the SMS Broadcast over a period of time * Set a custom validity period for the message
Advanced options for an SMS Broadcast

You can control when messages are sent by configuring time windows through the Calendars module, helping to avoid delivery during inappropriate hours. Additionally, you can limit the number of SMS parts per message. For instance, setting a limit of one part will truncate the message at 160 characters (or 70 characters for Unicode messages). To prevent overwhelming your call centre—especially when including a phone number in the message—you can spread the SMS Broadcast over a defined period. This can be set for up to 24 hours, and will respect the time windows defined in the selected calendar. If spreading is enabled, you’ll also have the option to pause or cancel the broadcast as needed. > 📘 Pausing, canceling and resuming broadcasts > > When pausing a SMS Broadcast, you must resume or cancel it within 3 days otherwise it's automatically canceled. > > If a broadcast is canceled, you are not able to restart partially the broadcast.
By defining a validity period, you instruct Naxai and the carriers to stop attempting message delivery after a specified time. Please note that this feature is not supported by all carriers and should be treated as a best-effort capability.
## Scheduling Messages Your SMS Broadcast can be scheduled by selecting the additional option "Send later" ![Send later option for scheduling an SMS Broadcast](https://files.readme.io/ec9bdd91d8ee40bfaab2b2cbf377577d79ed0132db8dcf3c13d0726ddbc0d883-image.png)
You can choose a future date, up to a maximum of 7 days in advance. ### Tip If you need to schedule later, you can first save your SMS Broadcast and then later schedule it. Date picker for scheduling an SMS Broadcast

Date picker for scheduling an SMS Broadcast

## Testing SMS Broadcasts Before sending the SMS broadcast, you can test it by sending the message to an existing contact. Test send screen for an SMS Broadcast

## Sending the SMS Broadcasts Click on Send now to send your broadcast or click Save to save your broadcast as a draft that can be reused later. ![Send now and Save actions for an SMS Broadcast](https://files.readme.io/9a2df3a0521581cef524be4242e6fb56d9b81ad59171925c71d43e7ba1ff8d1e-image.png)

## File Requirements Formatting phone number Before saving your file in a CSV format, you can use a formula in Excel to cleanup your phone number and ensuring it contains only digits by using **=REGEXREPLACE(A2; "\D"; "") ** The uploaded file must comply with the following criteria: * Accepted format: .csv * Maximum file size: 50 MB * Maximum number of lines: 150000 * The file must have a header, and the column header must only contain alphanumeric characters, including the underscore. * The file must have unique header names * The file must include at least one column that can be mapped to phone numbers. * Phone numbers must be in the E. 164 format without the leading +; if your phone is in the local format 0476123456, you must replace the leading 0 with the international prefix 32 (Belgium) , or 33 (France), ...

# Review SMS Broadcasts Analytics and Deliverability
When SMS Broadcast is saved or sent, you can access it directly when navigating to SMS Broadcasts.
![SMS Broadcasts list showing saved and sent broadcasts](https://files.readme.io/b1bb7b23ee68643e427d92d86d2f255c568fcc333235fefff389627c721a0ef8-image.png) You can rename or duplicate an existing broadcast and access the dashboard of deliverability. When an SMS Broadcast is in progress, you can pause and then resume or cancel the SMS Broadcast. You can access the details of messages sent and their deliverability status. ![SMS Broadcast deliverability details and message status table](https://files.readme.io/9aff974e2e164b08d6a984bce9c3942c5ecabc1ec74c75d5782b6e7cff162e74-image.png)
## Getting details for a message You can get a detailed overview of a message by clicking the phone number in the table.
![Detailed message overview for an SMS Broadcast recipient](https://files.readme.io/2bd523e3e677b90aff6cc79dda7ed648903f44d2b41e4364fcc146e961c0c7ea-image.png)