At least 10 million smartphones are susceptible to the attacks, called zero-click exploits, which let hackers upload malicious apps, spyware and impersonation scams to devices without users clicking on links.
By turning the phone off and back on, users reduce the chance of spear-phishing - when an attacker sends targeted fraudulent emails to steal sensitive information like login credentials.
Over time, hackers find new ways to break into a system, but updating old software will remove any potential flaws or loopholes they might have used to access your data.
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