It is important that you first verify that you did not receive an alert by checking your device’s “notification” folder. In some instances you might not see or notice the alert even though your device has received it. The alert might be “hidden” with other notifications.
If you didn’t receive an alert on your device it is important to do several things, including checking the phone’s compatibility with your service provider, as well as ensuring that you have updated the software. There are many factors that will impact your ability to receive the alert including your location, or whether you are connected to the LTE network at the time of the alert distribution.
Wireless service providers cannot identify how many devices receive the test alert (or any alert).