Systems and methods of using implanted or wearable micro electronic devices and for using a mobile device to communicate with and manage such micro electronic devices

A system and apparatus utilize a micro electronic device implanted in a person or group of persons, or wearable thereby, to manage a variety of activities, including gaining electronic access to an electronic lock, an electronic checkout kiosk at a store, a personal computer, a computer network, a vehicle lock or ignition, or a medical records database. The system includes an RF microdevice having an electronic identification code and attaching the microdevice to the user, an RF login system including an RF reader and a login processor. The user brings the microdevice near the reader, whereby the RF reader communicates with the microdevice via RF signals, and the RF reader signals the iogin processor to corroborate the identification code. If the processor does not corroborate the identification code, a login is not confirmed.