Person's status wall display The app is designed to run unattented without human interaction on an always-on android device, periodically fetching the last location information, and the last event from a configured calendar, interpreting th latter as the phone call record. The tracked person carries on him or her an Android handset with the app 'CallTrack' installed to sync the call log records to a calendar, and Latitude enabled. The 'wall display' app runs on another Android device, like an ebook reader with e-ink display (and network connectivity). On initial setup, this app is granted access to the tracked person's location and calendar via OAuth2.