If the owner can disable a phone with nothing but access to a computer or another mobile device, so can Google, Samsung, Microsoft, Nokia or Apple. Google and Apple have already demonstrated their ability to remove software from all devices using their respective operating systems. If the designers of a phone’s operating system can brick a phone, guess who else can do the same? Everybody from the NSA to your friendly neighborhood police force, that’s who. At most, all they’ll need is a convincing argument that they’re acting in the interest of “public safety.”