Is there any phone that runs mainline Linux/upstream Debian, and is available to buy right now?
I'm sick of big companies who removed the word Consent from their dictionaries. I want something I can own and trust again. Being able to run android apps would be great, but given how closed source Android has become, I doubt that apps run on an open system would be reliable.
100% mainline - not really yet, but from those that are close to mainline and on which you can run Mobian (which is upstream Debian with a small repo overlay for stuff not ready to go into Debian proper yet) and that you can buy new right now are Librem 5, PinePhone and PinePhone Pro.
If second market also counts then there are a few more options available - mostly former Android phones where hardware support is spotty though, so do your research first. That said, everyone's needs are different and what's there can already fulfill the needs of plenty of people, so it's a matter of figuring out whether you in particular are in this group yet or not.
I'm sick of big companies who removed the word Consent from their dictionaries. I want something I can own and trust again. Being able to run android apps would be great, but given how closed source Android has become, I doubt that apps run on an open system would be reliable.