I think I have success. I reinstalled Iode using the Linux installer, so it picked up the latest Iode 6.6 for Sunfish.
I have WiFi turned off to emulate being away from home.
At first, the Vodafone SIM (I had erased the eSIM and have not reinstalled it yet) connected as H+ but did not support mobile data (meaning, opening the browser and going to Wikipedia, the site would not open).
So.. using the GrapheneOS APN as a guide, an entry named “Vodafone RO live!” was installed and active. I edited that and the only thing to change was emptying the Proxy and Port settings. I left the Authentication Type alone - meaning it doesn’t have a value and I did not select one.
With that setup, and WiFi turned off, and Vodafone indicating LTE, I can use the browser to browse the Wikipedia site.
I could not proceed to testing the eSIM because the eSIM area doesn’t seem to allow adding an eSIM? I’m confused by that, but it’s a tangential issue.
To further test, I opened the Aurora Store and (with WiFi turned off to ensure it’s using mobile data), I installed the DuckDuckGo browser and the Wise app. With the DDG browser, I can browse Wikipedia using mobile data. But, enabling the Wise app required being on WiFi to be on the same network as my other devices that were used for verification. For both, downloading and installing the app happened over mobile data.
Bottom line - Starting with the default APN provided by the install/setup process, I erased the Proxy and Port settings, and now it seems correct.