mine Samsung Galaxy a32 4g (will probably switch to a Google pixel 7a somewhat soon) and the default web browser is Firefox but i am in the process of switching to iceraven
i could also get a /e/ os phone and an Samsung Galaxy note 9 on iode os
You can now get a fairphone with /e/ os pre-installed and with aparent support, if you’re thinking of gating a new one anyway. They don’t ship to the americas though, and if you get it re-shipped the 5g won’t work but if that’s not an issue it’s a good product