You do not get caller id on AT&T, and you do not get voicemail notifications until sometimes hours or days after the fact. I ran this on my pixel 8 for months. I had to actively call into my voicemail number like it's 2005.
The secondary profile stuff is just about useless. It's one step above having multiple independent devices. I did try having a Google profile, but you can't get notifications between profiles. You get a notification that there is a notification, so you then have to go through the entire 30 second process of switching profiles, which disconnects your Bluetooth headphones to check the other profile.
If you think regular users and normal people want to put up with this, you should really re-evaluate what you think an average user is. This is for hyper nerds who care more about security ideals than functionality. Graphene is not for the average person who wants caller id, voicemail, camera, and a web browser.