Functionality is very hardware dependent. I have no idea how up-to-date that wiki is, so be aware functionality for any given hardware may be better than it shows (ex. Fairphone 6).

TheMightyCat is apparently the first to solve the call issue for Linux phones, so I expect that solution to at least partially diffuse to other hardware and other Linux mobile operating systems in a relatively short time (months->year).

I am not very knowledgeable in this, but my understanding is that since postmarketOS is a mainline Linux kernel, it can utilize any Linux programs/apps. For android apps, Waydroid seems to be a working thing. I think @TheMightyCat@ani.social can probably answer the question better than me (assuming this is how you ping someone).