I only use my (Lineage OS) private phone for cellular telephony, some limited Google apps (Gmail, calendar, weather) and tethering my tablets and my GOS phone. As such any phone or MiFi router (which I’ve used in the past) would do. My work phone is a stock Fairphone.

So I only need a WiFi Linux or Android tablet with decent touch support.

There are Linux distros for tablets, though I haven’t test-driven one yet since there’s Lineage OS and GrapheneOS. I could imagine using an open hardware tablet with a community distro 5-10 years from now.