As per the title, this discussion is specific to users of custom phone ROMs in the USA.

Recently, 3G networks in the USA were shut down, and if you were using a custom ROM on your phone, you lost a lot of functionality, including the ability to make and receive voice calls. SMS and MMS were also impacted.

All carriers now require VoLTE in order for voice calls to work. This creates a problem where even if your phone supports VoLTE, your custom ROM may not, and you’re left with a 4G data-only device.

Currently, only phones whose manufacturer has made their VoLTE code available to developers will be fully functional in the USA with a custom ROM. This severely restricts our choices to maybe a dozen phones. The Pixel line is fully supported, and I’ve heard OnePlus phones are also working.

If you’re in the USA and running a custom ROM on your phone, what hardware are you using?
What ROM are you using? What works and what doesn’t?

Edit: I’m using a Pixel 3a with Lineage for MicroG 19.1, and thinking of migrating to Graphene OS.