Classically, phonespell was used to provide words that encode to the correct phone number when the indicated keys are pressed. It was also for many years a puzzle where only the digits are provided and you have to decipher the message. In modern times (on devices without touchscreens) it's used in reverse and called T9: You press the keys for the letters in a word and the phone determines what word is the most common one spelled with those numbers (replacing multi-tap, an earlier method in which you pressed 2 once for A, twice for B, and three times for C).
Also called: T9
Puzzles
MIT Mystery Hunt 1995 27: Hall
MIT Mystery Hunt 1998 Roamin'
MIT Mystery Hunt 2004 Worship of Zacazontli
MIT Mystery Hunt 2004 Rant
MIT Mystery Hunt 2004 Lost in the Boiler Rooms
MIT Mystery Hunt 2006 783658
MIT Mystery Hunt 2007 Cambridge Tea Party
MIT Mystery Hunt 2010 Round 4 Meta
MIT Mystery Hunt 2011 Famous Faces
MIT Mystery Hunt 2011 Redundant Obsolescence
MIT Mystery Hunt 2012 Phantom of the Operator Meta
MIT Mystery Hunt 2014 A Mad Cocktail Party
MIT Mystery Hunt 2017 Cutting the Cord
MIT Mystery Hunt 2022 Lists of Large Integers
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