Problem 1642, "Telephone Synonyms", in the Journal of Recreational Mathematics 21:2, pp. 156-8, 1989, concerned the relationship between words and US telephone numbers. The letters Q and Z are omitted, then the digits 2 to 9 are assigned respectively to ABC, DEF, GHI, JKL, MNO, PRS, TUV and WXY. Thus DOG is dialled as 364.
Word Ways: Vol. 29
, Article 17.
Available at: http://digitalcommons.butler.edu/wordways/vol29/iss2/17