@raymo Have you tried using a headset instead of the built-in mic? (I seem to remember this was one of the several suggestions back when the first Pro1X devices showed the problem, but I cannot remember whether they helped someone. When I was using the Pro1X, I also head some call quality problems.)
I hardly recall, it has been missing for so long....
I reported it fixed here https://community.fxtec.com/topic/3557-lineageos-191-official-release-for-pro1/?tab=comments#comment-61182
But it was broken again later....
Will be 5 years for me December 10th. My Pro1x is actually my daily driver... I like the keyboard better—as a writer, the key mapping for punctuation is better, and I don't do anything that challenges the weaker SOC. But I love my Pro 1 and use it for experiments. Right now experimenting with Google Free Lineage. Both work ok as phones, but I don't use either that way. I have a Pixel 7 Pro which is my phone and point and shoot camera and has all my sensitive bank type stuff. Everything else is on my rooted Pro1x, which means I am using my Pro1x 95% of the time.
I honestly never expected F(x)Tec to make a totally reliable phone for the US. It's just too hard for such a small outfit to do given the roadblocks the US carriers put up (which have only been increasing since 2019). I'm fine with this divergence and carrying two phones. I expected having to do that from the get go.
But those keyboards. I can never go back! So happy two have 3 (my Pro1, my IGG Pro1x and an Expansys Pro1x). Hope they can last until the next attempt at a proper landscape slider. Lol.
wow, that's already 5y ! in my case it's about 4½y, and still use it every day with the original Android OS, v9 i believe. because of that i can't install one or two other apps i would need, notably Leica's FOTOS app. ithe Pro1 has its quirks, just like the N900 had it. it's a shame that no big player phone maker produces such a thing - while for a tiny little company like Fxtec it's quasi impossible to come out with a perfect mature product. anyway, i love my Pro1 as it is, and use it every day...