On Wednesdays We Wear Pink- Giving Out Cell Phone Number

This is Susan from Planned Parenthood, I have her test results.
If you could have her call me as soon as she can.
It's urgent, Thank You.
No one likes unexpected phone calls!
I have a friend, Samantha, who notoriously likes to give out my number basically to anyone that breathes in her direction. They don't even need to ask sometimes.  She may even have a business card with my cell phone number on it.  I will get calls from an unknown number and know exactly where it came from.  Is it my next big business deal? Nope, just Sam giving out my number.
How private is your cell phone number? While the cell phone number isn't like a home address, it also isn't something that should be handed out freely, especially if its not by you. I really only want people I know having my cell phone number. 
I'd say the cell number is like the new home number, yes it can be public and pretty easy to find, however, you don't want a random dude calling you at 4am.