There will be people out there, who for whatever reason, own a secondary or secret mobile. This could be for safety, DV, upcoming plans to leave, or any other reason.
Please make sure it's switched off this weekend, in advance of the national emergency alert.
I read that your phone will vibrate for up to 10 seconds, even if it is on silent, so turn it off.
"The message will be received on 4G and 5G mobile phones along with sound and vibration for up to 10 seconds, even if devices are on silent."
Just that
Take care, stay safe