How do spam callers get your number in the first place?

Ever wonder how a total stranger ended up with your phone number? The answer starts earlier than you think, and a few small habits can keep it from spreading.

Ever wonder how a total stranger ended up with your phone number? The answer starts earlier than you think, and a few small habits can keep it from spreading.<p><img src="https://www.engadget.com/img/gallery/how-do-spam-callers-get-your-number-in-the-first-place/intro-1793828250.jpg" /></p>