How did the site find out my phone number?

Question

mobile connection

I'm sitting looking for one song, I got the site https://krolik.biz/mp3/838953-ehduard-surovyj-kto-... - when I clicked on the "download" button, the site opened in another tab
and for some reason it says my phone number. How did this site recognize him?

I noticed a thing: when I asked some friends to go to this link and it only worked for those people who have a lifecell

ps operator to use the Internet on a laptop, I turn on the access point on the phone, the lifecell
pps operator I'm not sure about the tags for the question, so correct me if I made a mistake

Answer 1

Ett due to the fact that this is essentially a service from your operator.
The operator knows your number, and when you press the button, this "service" will be connected to you