Currently a Pixel with an anonymous custom ROM, although I’ve got a PinePhone on my desk I need to test more.
Cell phones are incompatible with privacy. Any phone necessarily constantly sends your location to your cell provider just in order to work. But even if that’s true, there’s no reason to also let someone else be the remote administrator for a sensor node with a camera and microphone that you carry everywhere. Running a mobile OS with a universal backdoor is bad times.
Yes, posts you make to public forums are public.