@MrT10001
Issues resolved. Thank you.

@Georg I had similar problems with Libertine.
Instead of editing the file from "within" the chroot, i just edited it from outside (as the user "phablet"):
nano /home/phablet/.cache/libertine-container/focal/rootfs/etc/nsswitch.conf

also I highly recommend using the ADB Shell or SSH 🙂

Late response here: I just joined forum tonight. I use Ting in US, and use GSM SIM for my Nexus 5 running Ubuntu Touch. It's been fine so far.