Letting the Police put malware on smartphones, or even on across a mobile network makes us all less safe. It means that the technology we use every day would be made less secure, and more prone to attack from cyber criminals.
Our smartphones must be kept secure. We store so much personal information on our phones these days - personal emails, banking and online shopping apps, family photos, text messages, confidential documents, etc. None of this would be safe from leaks and hacks if the Police can order your mobile network provider to disable security.
The Police could look up every website you’ve visited in the last year. That will be hugely revealing of who you are. The Police won’t even need a warrant to access this information, enabling them to go on ‘fishing expeditions’. Your mobile network provider does not want to store this information about you, partly because of how difficult it will be and partly because they know they can never guarantee it won’t get leaked or hacked.
Your mobile network provider will be gagged from telling you that they are having to comply with the Police’s demands. Even if you are their customer and even if you’re not suspected of any crime whatsoever.