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Be sure to follow the rule before you head out.
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Some countries send it on a channel level which cannot be blocked/silenced/opted out of.
The 'presidential alert' level.
Sup. I've also had my carrier re-enable it wirelessly.
I don't have a screenshot of my own, but I found one on the internet:
If the disable method doesn't work, you can try
adb shell pm uninstall -user 0 -k com.android.cellbroadcastservice
Edit: AND
adb shell pm disable com.google.android.cellbroadcastreceiver
(This is the Wireless Emergency alert app specifically)(I've also disabled and/or uninstalled and/or firewalled and/or removed 'modify system settings' permissions many of my carrier apps)
Just live in a country which refuses to acknowledge cell broadcast exists, then you'll die in peaceful silence in the next national emergency while operators take several hours to to send 11 million unicast SMS.
Taps forehead
That is seriously fucked up