On this subject since it's an Australian seller and marketed as "DV safe".

Australia has a national test of it's phone alert system in 10 days at 27/07/26, 2PM AEST. (People in North America would know it as Cell Alerts/Presidential Alerts etc.)

There have been warnings that hidden phones will almost certainly sound, and their recommendation is to ether power off the phone or put it into airplane mode at least an hour before the test...