How to determine the mobile phone number when visiting a web page?

Question

Web development

Good afternoon!
Tell me, what are the options for determining the user's mobile number? Is it possible to determine the number when visiting the special. web pages? In this case, the definition of the number is needed on the server side.

Answer 1

Nothing can be done

Answer 2

become a content provider. The phone number is added to the request header by the opsos only when visiting their pages.