On my Pixel 7, I just flashed Graphene OS. It went fairly smoothly.

But I ran into a problem: The phone now does not support SMS or calls. Graphene OS Messenger displays "connection error 111" for me.
My SIM card worked flawlessly when I tried it on a different phone, so the issue is not with the card.
I attempted a restart.
I made an effort to clear the network cache and data.

Still, I am unable to activate Signal and perform many other random tasks without SMS.

Can anyone help me out, please? If not, I must turn to my "fiendly neighborhood stalker," Google.

Thank you!

    dKD Hello, I think you might have a problem with APN parameters. They depend on your carrier. So I suggest you indicate which carrier you use.

    6 days later

    Hello Eirikr70!
    I appreciate you giving me advice very much! As it turned out, I indeed had a problem with my carrier and the APN parameters. After some research on my carrier and the APN, I managed to put everything in order. Now it's functioning just fine, thanks to you!
    Many thanks and God bless!
    dKD

      dKD If you think this might affect others using your carrier, and that GrapheneOS has the wrong info for your carrier, you might file an issue on GitHub.