The selected "companion" can trace the location and movement of the friend's cell phone so as to determine whether he/she has unexpectedly stopped, has been suddenly diverted from his/her announced route or location, or is moving rapidly as if to escape danger. The "companion's" phone will periodically automatically ring the cell phone of the friend to ask if he/she is "OK." If the friend does not reply to the query within a certain amount of time, his/her phone will be activated to make a loud siren sound to draw attention. Other possible uses of the app are to keep parents informed of the locations of their children and to maintain contact with sick or elderly persons who live alone.
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