https://techcrunch.com/2017/10/15/mobile-phone-companies-appear-to-be-providing-your-number-and-location-to-anyone-who-pays/

You may remember that last year, Verizon (which owns Oath, which owns TechCrunch) was punished by the FCC for injecting information into its subscribers’ traffic that allowed them to be tracked without their consent. That practice appears to be alive and well despite being disallowed in a ruling last March: companies appear to be able to request your number, location, and other details from your mobile provider quite easily.

The possibility was discovered by Philip Neustrom, co-founder of Shotwell Labs, who documented it in a blog post earlier this week. He found a pair of websites which, if visited from a mobile data connection, report back in no time with numerous details: full name, billing zip code, current location (as inferred from cell tower data), and more.