SMS for WooCommerce integrates with SMS service providers which send out the SMS notifications.
To connect your SMS Service to your WooCommerce store, navigate to WooCommerce > SMS Settings and open the SMS Gatway panel:
Admin phone number – the admin phone number which you’d like to get admin SMS notifications
Sender phone number / Sender ID – this is the phone number or alphabetic number you’ll receive from your SMS API service.
Enable phone number validation on checkout – this option is only available when using Vonage (formally Nexmo) and Twillio
Enable the Do not Disturb – enable this option to send out SMS messages within a specific time range, for example 9 AM to 6 PM. If any message is scheduled after 7 PM, it will then be scheduled for the next day at 9 AM (Based on the store’s time zone settings)
Send a Test message – To test your SMS service connection, you can send a test message from within the settings panel.

Select your SMS service provider from the dropdown menu and enter in your API credentials.
Please note: You can add your own custom providers using a hook.
SMS for WooCommerce integrates with the following SMS service providers: