Could, yes. In 1990, the standard was to call 411 if you needed to find a phone number. And that often cost money, so parents would drum into their kids not to call 411. "We have 411 at home. ::slams phone book on table::"

Which means they'd have had a phone book, and everyone knew where it was. Sometimes local police/fire/hospital emergency numbers were printed on the cover, or on the first page. If not, there'd be a place on the cover where you could write them in yourself. They'd also come with a refrigerator magnet sign that you could write in with marker later on.

I'm not saying any of this to be disagreeable; there are a zillion plot holes in that movie. Just reminiscing with some late 1980s "day in the life" nostalgia.

Now get off my lawn.