@trwidick These settings did work for me and finally got my send and receive photos working (lte stable too)

@standupmobile I'm experiencing a similar issue with the route table showing no default route when on mobile data, but I am on the latest version (OTA17 i think). What interface did you add a default route for? any other details you remember?

I have been playing around with the port on the I3223 and it is working pretty good! A few things I am still trying to get working, like access the phone with adb when booted into ubuntu-touch. It might be related to the other issue I'm looking into, that charging isn't working either. If you plug in the phone while off, it doesn't show a charge screen and instead just reboots. If you plug in the phone while on, it doesn't indicate that it is charging.
Also I found that the mod from golliath51 is also necessary for single sim 10 Plus models to use cellular, just omit the slot2 parts.