CB alerts are activated by default on iPhones sold in Greece and running iOS 13.3 or newer. It is not recommended to turn off CB alerts on your device.
Toggle Cell Broadcasting on/off
Step 1: Open the Settings menu
Step 2: Under Select “Notifications”
Step 3: Scroll down at the bottom of the page, find the “Extreme Alerts” option and turn it on/off.
You may view your alert history at your Notification Center. From the Home Screen, scroll down to view the Notifications Center.