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If this is a problem that started after you got the phone and you didn't make any changes prior to the problem starting, it likely means a hardware problem with the camera.
You can try to give the camera a couple taps, and/or open it up and make sure the thin wires that connect the coil around the lens are still connected.
You can also attempt a factory reset, but this is unlikely to help.
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Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth