Guys, would you text a girl 24/7 if you thought of her as "just a friend"?

I talk to one of my guy friends every day, throughout the day, from morning until night. We talk about everything: music, books, school, personal things, anything and everything. There is subtle flirting, but I don't know if I should make anything out of it. We occasionally talk on the phone, and when we do the conversations range from 30 minutes to an hour. I know he doesn't really like talking on the phone, and that I'm the only one of his girl friends that he talks on the phone with. We've never discussed what we are: friends, more than friends, whatever. I like him, but I just don't know how he feels.
Guys, would you text a girl 24/7 if you thought of her as "just a friend"?
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