@rocket2nfinity thank you for the info.

Pixel 3a on OTA-19, stable update channel, using a Verizon SIM card.

Before installing ubuntu touch I verified that the phone can connect to towers, make phone calls, and use mobile data to access the internet with my SIM.

Ubuntu touch doesn't appear to be connecting to the network.

In the "Cellular > Carrier" menu there is only the automatic option. Two APNs are found but "checking" them doesn't enable a data/network connection. I am unsure what the cause is, does anyone have any ideas to try and narrow down what could be causing this?

I had to buy two because I got shafted with a verizon model first time. I bought the second 3a from ebay seller "thegizmotrader" and it was guaranteed to be have an unlockable bootloader and be carrier unlocked, both of which it was. Try giving them a shot.