On Beezer you also have an option send SMS notifications to your users.
Please follow below instructions to enable to SMS notification:
Step 1. Navigate to Engage section on your Beezer Dashboard.
Step 2. Use the toggle button 
to enable the SMS pop-up option.
As soon as the SMS pop-up is enabled, this will activate a pop-up on your app requesting any new visitor if they "Would like to receive SMS from this app ?
If any user or visitor submits their Name & Number in the SMS pop-up box then it will show under Engage in the SMS section. Select Users or Visitors from the drop-down menu at the top of the page. If the end user was not signed in when they filled in the pop-up fields, then they will be displayed under Visitors. If the end user was signed in, then they will be displayed under Users.
Select the user you want to send SMS message
Click on Share button, a pop-up will appear wherein you can add your custom message to the User or Visitor and click on confirm to send the message.
Once you send an SMS notification, you will notice this will be taken from your available SMS credit. If you need to purchase additional SMS credits, you can do so by clicking on the Buy More SMS button.