Sending SMS to multiple phones

Thanks. I tested putting two numbers into the SmartThings native apps separated by either a semicolor or a comma. It does not work. If more than one number exists in the SMS text field, nothing is sent. This really is something that SmartThings apps should support. When the security alarm is ringing or motion is detected where it should not be, I would think most people would want to send the SMS text to more than one phone.