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We need these all over the place in the U.S. - If the tech works out, problem solved, fewer chemical battery downsides. https://www.euronews.com/green/2024/02/06/this-disused-mine-in-finland-is-being-turned-into-a-gravity-battery-to-store-renewable-ene
The answer is here, but you just can’t fight physics. Light needs to come through a lens and hit a sensor. There has to be some significant distance, in relation to the thickness of the phone for this to work. Until camera technology advances and somehow produces a comparatively sharp image, we will be stuck with the bump. It’ll happen at some point I’m sure, but there is a whole bunch of tech that will need to change to get there.