Can't believe after all these discussions, people still think the noise is some kind of defect.
Check out this video https://youtu.be/neLzN4QtTIk?t=339
Which clearly showing you the lens moves freely when not powered on.
That is NOT A DEFECT, that's the mechanical structure allows the camera to FOCUS and do IMAGE STABILIZATION.
They will not be powered on if not being used, thus, the lens moves freely in the camera module case.
If your phone have multiple camera, different focus range actually using different camera, so even your camera app open, it's not using all the camera at the same time, the one not being used may still make noise if you shake it.
And I see some comment here saying cameras using BALL BEARINGS, and that's where the noise come from, WTF???
NO, THERE IS NO BALL BEARINGS, they are using electromagnetic field to hold and change the lens position, there is no moving parts other than the lens itself.
The rattle noise is just simply the lens come in contact with the camera module case, which is 100000% normal.
In fact, ANY phone camera do this, the difference is how big the camera module or how many camera they have, what that effects is how the noise sounds like and how loud it is.
I have one s4, one s5, one s6, two s7, one s8, one N20U, some old HTC phone, THEY ALL MAKE NOISE IF YOU SHAKE THEM.
The difference is they are not sounds the same, some may not that easily catchable.
Further more.
When Note20U just released, there seems a protection feature, if you shake the phone a little (even the screen is locked), it will power on the camera module to hold lens in place for a few second, if you let it down, you may hear a tiny click noise, which is the camera module powers down and the lens drops down due to gravity.
And that feature seems being removed somehow on recent firmware versions, maybe the click sound annoying more people than simply let the lens slide around.
