On November 28, 2018, Ontario will be issuing public test messages through Alert Ready, Canada’s emergency alerting system. Ontario will issue one test message to be distributed over television, radio and to compatible wireless devices at 1:55 PM EST.
The Alert Ready system has enabled authorized government agencies to deliver emergency alerts to residents in Ontario during threat-to-life situations over television and radio. It is important to note that not all Ontarians will receive the test alert on their wireless device. This may occur for a variety of reasons, including device compatibility, connection to an LTE network, cell tower coverage, device software and settings.
For more information refer to the Alert Ready website https://www.alertready.ca/wireless/