# Twilio SMS
The **SMS Options** section allows you to connect Bookster with **Twilio** so the system can send SMS notifications and reminders to customers or agents.
Before using SMS Notifications or SMS Reminders, you must configure and verify your Twilio credentials here.
**SMS Notification**
Enable this toggle to activate SMS functionality across the system.\
When enabled, Bookster can send SMS notifications and reminders using your Twilio account.
**Account SID**
Enter your **Twilio Account SID**.\
This value can be found in your Twilio Dashboard and is used to identify your Twilio account.
**Auth Token**
Enter your **Twilio Auth Token**.\
This token is required to authenticate requests sent from Bookster to Twilio.
**Sender Phone Number**
Enter the **Twilio phone number** that will be used to send SMS messages.\
The phone number must be purchased and verified in your Twilio account.
Example format:\
`+1234567890`
**Send Test SMS**
Click **Send Test SMS** to verify that your Twilio credentials and phone number are configured correctly.\
If the test SMS is delivered successfully, your SMS integration is ready to use.
**Save Changes**
Click **Save Changes** to apply and store your Twilio SMS settings.
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