Why do harassing calls often intercept short messages?

Browsing "bad websites" There are often harassing calls to intercept short messages, because browsing "bad websites" requires too much permission for mobile phones. The mobile phone is not configured with SMS and harassing phone interception. Internet information age is also a "big data age", that is, information protection is very strict, but it is still easy to leak, especially the mobile phone number used. Once leaked, all kinds of troubles and harassment will follow.