I’ve been using N Dial for a while now (maybe 5 months or so) and can compare it to the pre-installed Phone by Google on the CMF1.
I love the looks and the overall style (I use it with English (UK) as the default language).
However, I can only get a few phone calls in before I have to reset the phone for it to work. Usually this is 1-2 days max. I feel that it’s because my phone is constantly switching between WiFi and 5G/4G all day long (I work as a prof on campus) and I walk around I can see the phone switch from WiFi to 5G to 4G (when I leave a building and walk to another one) and back to WiFi maybe 10-20 times per day.
This does not occur with N Dial if I never use WiFi and just use 5G/4G.
It never happens with Phone by Google.
I’ll test N Dial Nimbus as see whether the same phenomenon occurs.