Whenever I shake my samsung s20ultra it makes this sound like something is loose on the inside. This never happened on my note10plus. I usually shake my phone to tale screen shots and now when I do on the ultra it makes a sound like something is loose in the camera area
As @userQQHQoe49tl stated "This isn't a problem. It is just the lenses of the camera moving around when not being used. The lenses are stabilized with electromagnetism. When they aren't used, they will move around as there are no gears or mechanics to hold it into place."
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Yes I noticed it too at Unpacked last month. At the time I was told that it maybe a pre-production unit or whatever, but after watching some tear downs, I have a theory. While there were some reports of click or weird sounds coming from previous models, it's not the same thing. With S20 Ultra it's louder and definitely much more noticeable, but try this... if you open the camera and try shaking the unit, the rattling sound stops completely. Close the camera and it returns. I believe it's the zoom lens autofocusing system. The lens are positioned sideways, and they are on tiny rails, moving left and right when focusing, so when camera is not in use, they move freely when you shake your phone.
I don't think it's harmful to the device, but of course I'd say try not to shake your phone on purpose too much.
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