Tough to get percentages cause it changes so much from book to book. Here are some generalizations from books I talk to:
The more wise guys, the book has, the more phone action.
Credit books usually have more phone action than post-up.
My take is that Judge is the exception. Most want their customers to use the internet cause it's cheaper.
Anyways, I've seen 80/20 phone and 80/20 internet and everywhere in between.