This invention is a no-brainer. If you have a smart phone, you need to secure it with a password. Furthermore, it would be good to render it inoperable, except for providing return information when it's lost.
The answer is a ring that you can wear, or an RFID card in your pocket, or some sort of wifi or blue-tooth ID matching that when present, unlocks your phone. When at an intermediate distance, this device might cause the phone to chirp, unless it's physically deactivated by the person who has the ID matching card, ring, RFID tag. Why should I have to log into my phone all the time? If I have the proper ID signal, it remains unlocked.
Does anyone already make this? I have read about this concept being used for firearms - where the owner has a ring that allows firing of the gun. It seems straightforward enough it should already be out there for smartphones as well. Furthermore, how many RFID tags do I need to carry around with me? It seems more systems should be set up to accept external RFID tags, if the numbers are appropriately unique. If a card is stolen, that number can easily be disabled in the system.
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