A period and ovulation tracking application for both android and apple that has existed since 2013. It has over 8 million users and is one of the most popular period tracking apps.
An imaginary phone, whose futile hope, is to alert the terminally oblivious to reality.
This put down probably unintentionally originated in 1973 with the forerunner of Wheel of Fortune, Shopper's Bazaar. A player could pick up the clue phone in front of them to hear whether the puzzle was a person, place or thing.