One source is right here:
Have I Been Pwned allows you to search across multiple data breaches to see if your email address or phone number has been compromised.
haveibeenpwned.com
My phone # is not pwned yet, thank goodness. Plus, I have not gotten any spam texts, robo calls or whatnot lately. If you get any of those on a daily basis and you can't nail it down to something you shared, you have to wonder, right?