tl;dr:

Australia’s prime minister, Anthony Albanese, has told residents they should turn their smartphones off and on again once a day as a cybersecurity measure - and tech experts agree. He said rebooting a phone regularly could minimise risk because it forcibly closes any applications and processes running in the background that could maliciously be monitoring users or collecting data. Nanda said some of the benefits of rebooting a phone could be achieved by regularly closing apps that might be running in the background. There could be other malicious processes running on a compromised device that will only be stopped by turning the phone off. Some components of phones can remain active even if turned off.

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