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At 3pm today, Sunday 23 April.....a Doomsday alarm will sound from your Mobile Phone / Big Brother snooping device - If you do not wish your privacy to be infringed upon, then go to settings and notifications and look for the option to stop/block the alert.

Alternitavely - Switch it Off.

this may not be applicable to older, non smart phones, but as they dont have the oiption to cancel the communication, Off could be the best solution.