> didn't work for cellular location data

The fact that the data would be local is why I suspect the response would be different.

Did I miss a large leak of cellular location data? I would have guessed that would make headlines.

Yeah, historically a lot of the aggregators of cellular location data have had huge security issues.

One of them even had a demo page open to the internet that just had a 'Has consent?" checkbox. Showed me my own location within two blocks without any real validation of consent. No options from the vendor to disable this.

Contacting T-Mobile just gets you a PO Box you can mail a letter to.

An article on one of them from years ago:

https://krebsonsecurity.com/2018/05/tracking-firm-locationsm...

I didn't thank you when I read your source last week. I appreciated it.