Fully controllable pocket computers. Surprisingly, the tech has been there since the '90s, but never really caught up. Then it went into a weird walled garden direction with mobile phones that often work against you. Pocket computers are still sometimes janky, like Linux phones are, but having access to all the software and permissions is an unparalleled power.
Which one are you using?
The Librem 5. It's the closest to controllable you can get now.