The situation with phones is pretty bad now. The phones that have or support open-source ROM (Pinephones, Pixels etc), are usually expensive and cost like 2-3 normal phones. So it might be cheaper just to buy a non-free phone and keep it in airplane mode (and connect it only to a airgapped home WiFi network to transfer data), and a second dumb phone for calling. Or have one phone with your data, connecting to Internet via second $50 phone, which has connectivity, but no data, and DPIs all requests from first phone, basically serving as a portable router.
And proprietary phones are really bad, today I read the news that Samsung promised to comply with law and auto-install Russian software (like Vk, Kaspersky, Rustore) when the phone is connected to the Internet. And that's a Korean company. Consumers are treated like garbage today.
It's understandable that you earn more on expensive phones, and freedom is not free, but I don't want to buy a phone that costs like 2 cheaper phones + a guitar.
I would prefer simply having something like GrapheneOS with root access.