This is a great idea if the user has, or can take, sole control over that switch.
If my phone must enable me to kill it remotely, neato. If anyone else will be able to kill it while I have it, that's terrible.
If my phone must enable me to kill it remotely, neato. If anyone else will be able to kill it while I have it, that's terrible.
"Get the remote block when you buy a phone" is at least a nice clear message.