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David Wheatley Profile picture
David Wheatley
@davwheat_
19. Developer at @Flarum, degree apprentice at @ThalesUK. Mobile networking is my hobby. Also kinda like trains, sometimes. All views are my own.
Apr 23, 2023 • 6 tweets • 2 min read
Initial outcome of Emergency Alert testing (Cell Broadcast): all networks except Three received an alert in my household.

*One* person in a large group of us around the UK received the alert on Three, in Cardiff.

Let's go into why.

#EmergencyAlerts Image Networks who successfully performed the trial did rebroadcast the signalling (SIB12-v920) continuously for the full 20 minute duration of the test, stopping the alert at about 15:21.

This meant, if you had a device in airplane mode until 15:15, you'd still get the alert.