Galaxy Ace in 2017. It could, very well, do absolutely nothing at that time ever since the Android Market and GMS for Gingerbread were shut off and all the apks I can sideload are discontinued and outdated versions, some of which absolutely not working.

I believe this is gruvbox

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Just embrace the external DACs. It allows you to upgrade your audio experience anytime, unlike with the jack where the DAC in your phone may be pretty eh at times

I have been using the Apple USB-C DAC ever since both my Poco F1’s and my Ideapad’s jack died, and enjoyed the significant upgrade the DAC brought to the sound quality.

Oppo Reno 2. Has everything you asked except for the removable battery. My aunt’s been using for 4 years and the cameras are really good. Cons are: EOL, it’s pretty old and has ColorOS if you do mind.

Just get an external DAC bruh. If your DAC lasts long enough, it is not unsustainable. Also at most times, a DAC sounds better than the jack itself.

I think of them as “design” company, although they are really an aesthetics company. They simply make bog-standard devices with outstanding aesthetics and “features” and custom icon/widget packs for the Pixel Launcher that ships with the phone, for people that want something “different”. I have always contemplated the innovative-ness of the glyph system and if it even makes the phone experience any better.