FOSS stands for free and open source software.

Even Android is mostly FOSS, and I think none of the devices you mention run only FOSS (some firmware blobs & closed device drivers are ususally required)...

Are you really looking for free & open hardware? Completely free and open, or just “mostly”?
I know of no device that would fulfil that; maybe the OpenMoko in its day.

The only attempt at making a completely FOSS smartphone OS (software, not hardware) is Replicant.
Are you going to add the devices it supports to your list? Probably not.

Depending on what you really mean I can think of some articles to add to your list, or some to remove...

Please be more specific on what you really want here. It seems to me that the term FOSS does not apply.