Just chiming in to say that I was able to freeze all three online yesterday. No calls needed!
http://clark.com/personal-finance-credit/credit-freeze-and-t...
Of course, Equifax just gave me a 500 AND charged my card anyway, so that was nice. The other two worked fine though. Equifax is a steaming pile of garbage.
Edit to mention that I only used burner cards for the payments.