Actually, when you think about it, calling someone is being lazy, and texting is harder. So what could be 10 to maybe 50 texts could be 5 minutes in a conversation.
And some people also text because they don't want people butting into their conversation, knowing what's their life, and maybe they just want to be quiet. And maybe someone's in class, and they want to talk to their friend.
I myself have an unlimited texting plan and I text alot, but I also call alot, too.
-CapN