I don't understand how people think they are being so 'secure' by not using their phone #. Have you ever applied for a job, especially a technical one, welcome to being flooded by the bombay job squad for months or years on end. Own a business with your phone # on your website, welcome to getting spam galore calls ALL THE TIME. Even doing a random phone # check with various spam call sites, you can see who owns the #. Someone knowing your number doesn't mean jack now a days, and for all you younger people, there was a book that was published 1-2 times a year with everyone's name and number......

Rotate your email addresses, or use throw aways, but sorry friend your phone # is out in the wild whether you want to admit it or not.