If letters were added to telephone rotary dials, the word could not have been spelled out is one that has the letters Q and Z.
In the times that telephone numbers were said to be longer than five digits, because the fear looms that consumers would have a hard time taking in phone numbers, all the number from 2 to 9 was given three letters.
Note that letters Q and Z were said to be the only two letters that were not used and as such, If letters were added to telephone rotary dials, the word could not have been spelled out is one that has the letters Q and Z.
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