Pinephone + AOSP Mental Model

[amosbatto]

(mmmm... I can't upload images from my machine on a post?)
Ok here's a link I guess: https://ibb.co/CPF0MHt

In the "Typical Android OS" graphic, you need to add the proprietary additions of cellular service providers (which can be quite a bit for providers such as Verizon). In the Americas, these providers often lock the phones, so you can't use them with another cellular provider.

The apps and skin that LineageOS (and /e/) adds to AOSP are FOSS.

To answer your question in the "Vanilla AOSP" graphic, the only binary blobs in the Pinephone should be the firmware for the Realtek WiFi/BT chip. I haven't checked the code of the GloDroid port for the PinePhone to verify this, but AOSP shouldn't require any more blobs than the Linux versions.