In a nutshell, if I go to the ##4636## menu, what kind of LTE configuration info should I see on the 6A? This isn't strictly a GrapheneOS problem, but I cannot find much info on this elsewhere. If I watch the "LTE Physical Channel Configuration:" field, it will populate with lots of information for a couple of seconds after activating a connection, and then some time later, it will just show {} and even later the brackets disappear and it says nothing at all.
I am wondering if this could be related to an issue that I'm having of not reliably receiving voice calls. I'm seeing on Reddit and elsewhere that people with Pixels 6 and newer are having problems receiving calls (ie they all go straight to voice mail and the phone never rings). I can say I have this problem too. I've now had several people tell me that I am totally unreachable, even though my phone is on all the time with a well above average signal strength. I should add that outgoing calls work just fine, and there is a (short) window of time that I can receive an incoming call after I either reboot the phone or make an outgoing call. I've contacted my carrier and they even gave me a new sim card and made sure everything was appropriated on their end as expected. If I cannot get this to work, I will probably have to downgrade to a 4A which does not have the problematic Samsing modem.