One might use it in case of theft or having lost a device.
Things that would be desirable would be
- Being able to erase everything on the device (possibly doing a factory reset remotely) and doing this as quickly as possible to keep someone who has a hold of it from getting a hold of your sensitive information.
- Being able to call or text the device if it's a phone
- Being able to have a message display on the device for anyone who has a hold of it
- Being able to see the current location of the device via GPS for yourself and law enforcement authorities