DeletedUser443 Also, genuinely, besides general location via cell location (even accurate location) and obviously any call / text data which I know is very insecure which is rare for me anyway, what kind/is the lot of data that telco would be getting you mention in your comment?
With standard usage, a cellular carrier knows where you live, where you work, how often you visit casinos and bars, when you sleep, and who you sleep with. And if a VPN is not in use the carrier knows which web sites you visit when (maybe it's OnlyFans...maybe while you're at work?).