this post was submitted on 01 Jan 2024
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Maybe, but a wouldn't it be way better to rely on a service every cellphone can receive by default, namely cell broadcast?
They even implemented this in Germany a few years ago after it has been available for twenty odd years.
Pretty sure emergency mobile broadcasts are included (at least by gov agencies) but you know what happens with these things that are only used for emergencies:
"It's annoying can't I turn it off?"
That's why I still think the more methods the better. It's probably one of the few reasons I'm okay with being bombarded with messages (not in jp, but literally got 2 earthquake warnings yesterday).
It looks like Japan's current implementation of their J-Alert system can start warning citizen about 2 seconds after the info is automatically received by the system. It warns them via nationwide loudspeakers, TV, radio, email, and cell phones. So they've got their bases covered, so to speak. They may be able to turn off alerts on their phone (the article doesn't say), but probably not on anything else. Definitely not the loudspeakers.