Restarting a smartphone takes just a few moments, and yet it’s something that many of us rarely take the time to do. However one major US spy agency is now calling on smartphone owners to consciously turn off and on their phones at least once a week, as this helps to protect the device from certain hacking attempts. Malware launched via spearphishing and zero-click exploits can be prevented by manually turning the device off and on again, according to a list of “Mobile Device Best Practices” issued by the cyberespionage analysts at the US National Security Agency (NSA). Android smartphones can…