Even if you had heard of it, it's not reliable due to being a normal app. It's affected by energy saving settings, DND etc. I've had it installed for a while bu

Even if you had heard of it, it's not reliable due to being a normal app. It's affected by energy saving settings, DND etc. I've had it installed for a while but the time when you actually get notified varies a lot between people, depending on their phone's behaviour. Cell Broadcast/EU-Alert is the way to go for this and I have no idea why they thought an app would be better.