After Snowden and stuff like this, I assume if the government (at least federal) really wants it, they can procure it. Plus, the location data is probably saved so it’s just a matter of querying a specific phone number to see the whole history.

https://www.theverge.com/2019/7/16/20696222/att-location-dat...

> The suit stems from recent investigations into how AT&T and other wireless carriers share the sensitive data. A New York Times article last year found that law enforcement has used the data to track phones without a court order. In another investigation, published earlier this year, Motherboard was able to pay a bounty hunter $300 to track the location of a phone using the data. Several lawmakers were quick to criticize the companies’ policies following the Motherboard report.