I finally gave in a few years ago. I HATE HATE HATE giving out my number. My phone is for MY convienience, not yours. I use it when I need it, but if I had to give it up, I would.
Unfortunately, I've grown addicted to the convienience of being able to call my DH and ask, "what was I supposed to get at the store for you?" or call a friend to pick up my kids when I am running late....plus the ability to drive cross country, get lost and call someone for directions!
If it cost much more than it does now, I would give it up. BUt if you are offering $10 a day.....I'll take it!