I don't give my phone number to anyone, except coworkers.
Mainly because they usually need my help while I'm on my trips (either vacation or business). I generally give them specific ringtones too.
Had to change it when one of my bosses called me from next door and he heard klaxon sirens coming from my phone...thought we were in WWIII or something like that. It was pretty hilarious (the client had a great laugh too). I got a stern talking to by him later.
The other partners thought it was hilarious.
I changed his to wind blowing.