Bruce Schneier recently shared an excellent article written by Vice about how the FBI gets location data from cell phone providers like AT&T, T-Mobile, and Verizon. It looks like this article is based on a leaked 139-page presentation from 2019. Although this article only talks about carriers in the USA, you can be sure that a version of this is also happening in your country.
Here is a link to the ARTICLE – https://www.vice.com/en/article/m7vqkv/how-fbi-gets-phone-data-att-tmobile-verizon
Here is the link to the 139-page PRESENTATION – https://propertyofthepeople.org/document-detail/?doc-id=21088576
Wishing you a great day ahead 🙂
Incognito Privacy Care.