It has a built in email client. Like, who does that?

Like Seamonkey! 😂

Tried installing MicroG from the F-Droid repo, and ‘My Visual Voicemail’ app at least partially works now. See my other new post for details

Just an update in case anyone is facing similar issues;

I installed MicroG on my vanilla LineageOS ROM using the F-Droid repo on their web page. I tried downloading the ‘My Visual Voicemail’ app again, and it now partially works, but at least it’s usable now. I still get a popup when I open the app that says Google Play Services is required, but I can now at least close the dialog to view, play and delete messages. Before it wouldn’t let me close the dialog. Not sure if notifications are working as I havn’t got a new voicemail yet, but it’s at least usable for my purposes

I’m hoping to stick with vanilla LineageOS.

Yes. I can hold the 1 key down, and it will give me a voice menu to listen to my messages, but I get no notification when there is a new message. I previously had an iPhone, and in that dialer there was a voicemail tab that showed my inbox and you could listen to/delete the messages from there (and I got a notification when there was a new message).

There are some Play Store apps that have this function, but I have yet to find one that works without Google Play Services installed

Can you actually get a commercially produced device with this chip?