At some point your Notify log may begin to be populated with a Not -Delivered Status.
The status is what is returned from the carrier to us. Se we are just echoing what they are telling us.
Carrieres have been known to update spam filters without the consent of consumers and our messages start getting blocked.
For privacy reasons you must reach out to customer service with your carrier.
After that- please lets your dispatcher know so they can send a test message.
It has also been reported that updating the OS on your phone will help to reset and allow messages to pass.