Why bother? They already have access to cell phone location data and meta information. I'm sure in China it is direct access. In the US it is a two-step process. Not that it would make much difference in practice.

https://www.techdirt.com/articles/20130901/23253224379/att-h...

There was a great article in Australia about this a few years back: https://www.abc.net.au/news/2015-08-16/metadata-retention-pr...