Ive done my share over the years and very few had any provisions for phone, like Bill said once you penetrate the floor stop drilling and push through the insulation and vapor barrier

I use a glow rod with some pull string on it to pull from inside and a gopher pole or the like to grab the string without having to crawl underneath

be sure you keep the wire off the ground as rodents like to chew on it

be careful when pulling your cable that it doesn't get chewed up by the tie downs

plan on using biskit jacks or flush mount with a surface box

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Serving SW and West central Fl since 1984