My number is on my PsychologyToday page and my NPI profile, so hopefully from there, but I wouldn't be surprised if they bought it from the university I went to or got access to a government database associated with my license

Everyone and their brother that collects data for something will sell it to the highest bidders

When I was signing up for the army in 2012 they asked me if I knew anyone who might wanna join, I think there was a bonus involved? Anyways I gave them no names or numbers and got nothing, not even the other bonus they promised me.

Never trust army recruiters.

The medical school application system, AMCAS, sells the information of every medical school applicant. I had to call the recruiters' office and explain to them that I have multiple failing organ systems and take more than 10 medications a day. I asked if they could get me a medical waiver for chronic kidney disease and they sheepishly agreed to remove my name from their list.

Specifically for medical stuff, they swipe your number and email when you take the MCAT. I was debating an MD/PhD so I took it and even never applying or getting into med school they'd randomly email me, for like 5y after.

they own the telecoms and all tech companies..they literally have everything you do online documented and put into a profile about you.