I think first you need them all as just numbers without any characters in them, so you could use substitute I think.. Create a column beside it, and set the formula as =SUBSTITUTE(A1,"-","") (assuming the column is A) then fill the formula down.. do the same for the ( and ) characters.. Or copy the column to a new worksheet and do a search and replace for those characters.
Once you've got it as all numbers, then create a custom format that's just ###-###-####
This won't handle phone numbers over 10 digits though.
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