If you don't need ANY apps on your main number, good dual-Sim feature phone (but be extremely picky, some are utter trash). The for all the smart stuff, Pixel

If you don't need ANY apps on your main number, good dual-Sim feature phone (but be extremely picky, some are utter trash). The for all the smart stuff, Pixel 6 with GrapheneOS. You can confine various "classes" off apps to dedicated profiles, so they'll never know of each other, and you get a vastly improved security (multiple releases in the month) and significantly improved privacy.