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Has anyone ever released a two-sided phone, with a screen on each side (so the opposite idea of one that closes like this, no hinges)? Bonus points if they're two independent phones but sharing the same battery, e.g. for company phone and personal phone

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Why would you want a device with two screens where you can only look at one of them at a time? It'd make a lot more sense to have a single screen and a switch (maybe in hardware?) to toggle between "screen 1" and "screen 2".

A low power e-ink screen on one side for reading e-books and the like, an ordinary screen on the other for video, games and other things which need low latency and full color. It's been tried a few times but never really took off:

https://www.eink.com/mobile-wearables.html?type=application&...

You just really enjoy worry about screen scratches

Yotaphone + 3 has this, the display on the back is an eInk display.

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