https://arstechnica.com/tech-policy/2019/01/after-broken-promise-att-says-itll-stop-selling-phone-location-data/

Mobile carriers are again promising to stop selling your phone location data to other companies—this time for real.

The four major carriers pledged to stop selling customer location data to third-party data brokers in June 2018, but a Motherboard investigation published this week found that T-Mobile, Sprint, and AT&T were still doing so.