I was going to set up new post about my issue but dropped on this one.
My opinion is that there is no good dialer in F-droid not IzzyOnDroid.
Welefone and Emerald are very basic, in fact: primitive. Amadz is very basic too, again - not configurable to my needs.
Fossify Phone lacks some options, like grouping all calls by number or contact, instead it groups by day first, then by number. They devs are not inclined to follow user reports, not only about this particular app.
I wouldn’t like to use Right Dialer from Goodwy because they insolently copy Fossify code to their apps.
Last but not least: no spam call blocker works with any FOSS phone app. In fact even Google phone stopped working as a spam blocker of unknown number calls.
Do you know any good phone app outside of F-droid/IzzyOnDroid repos?