https://motherboard.vice.com/en_us/article/d3bnyv/google-demanded-tmobile-sprint-to-not-sell-google-fi-customers-location-data

On Thursday, AT&T announced it was stopping the sale of its customers’ real-time location data to all third parties, in response to a Motherboard investigation showing how data from AT&T, T-Mobile, and Sprint trickled down through a complex network of companies until eventually landing the hands of bounty hunters and people unauthorized to handle it. To verify the existence of this trade, Motherboard paid $300 on the black market to successfully locate a phone.

Google, whose Google Fi program offers phone, text, and data services that use T-Mobile and Sprint network infrastructure in the United States, told Motherboard that it asked those companies to not share its customers’ location data with third parties.