I've heard great things about GrapheneOS, and I'm going to buy a pixel 7 pro soon just for that reason. I'm afraid I can't help with your other issues.
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Yes, I was thinking in the same direction but for me it is important for my banking app to work and don't want to do some hacky way to trick it.
I use grapheneos on A P7 pro. Banking apps work fine because the bootloader gets locked with grapheneos. This is what most banking apps would complain about. Also if it for some reason requires google play services this is available too in a sandboxes way.
It seems to be a P7 problem, that affects some users. It seems to occur after the Android 14 update. My wife's phone does the same. Some people solve it by downgrading to Android 13
The pixel 7 and 8 I use never have those problems. I suspect the culprit is your network signal, not your phone. Do you have a reliable provider and are you in a location where the signal travels well?
Yes, the provider is having very good coverage. Is it possible that the SIM card reader has bad contact with the SIM card and because of that to have issues with the coverage?
@filister I picked up a new P7 pro a few months ago to try Lineage, Calyx, and Graphene. My daily is a OnePlus 11. I really enjoyed the Pixel and set it up for daily use. I stayed with it for a while, but cellular connectivity is really poor compared with Snapdragon 8 Gen 2. So it's now a combo test device and fallback if something happens to my OP11.