An iPhone would not be a step up but a jump down.
An iPhone would not be a step up but a jump down.
I have a Galaxy Tab S5e on the way that runs Android + Samsung DeX Linux. I'm hoping to use the Linux aspect heavily, so less of my info flows to Google. But I'll need to dig into it a bit to understand how they keep the data separate (if they do).
For software support I can generally recommend the Pocophone F1 by Xiaomi. The process of unlocking the bootloader is an insult, but after killing of Xiaomi software the user experience is quite good, with pretty good hardware for quite little money.
As soon as you have a compatible OS ("ROM") running, you will generally not have to worry about hardware, but making one is a considerable amount of work, so if you're intending to install a custom OS you should better choose a phone with good developer support.
I have been thinking about starting a database of good phone choices for modding/free software, but am not sure how much interest there is.
Cellular modems with open firmware are prohibited in 140 countries, including US and Europe.
For US: https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm...