A device listing needs to prove condition, which means close, well-lit photographs of the exact item. That is also the recipe for capturing every identifier printed on it.
What ends up in frame
The serial number, and on phones the IMEI. On the box, on the back of some devices, in the About screen that people screenshot to prove the model and storage. Serials are used for warranty lookups and for cloning listings - a scammer with your serial can produce a convincing fake listing for a device they do not have.
The lock screen. Notification previews, a wallpaper that is a photo of your family, a calendar widget with names on it. The screenshot taken to show "the screen has no scratches" often shows a good deal more.
The reflection. A dark, glossy display is a mirror. Photographers know this and sellers do not. The room, the window, the person holding the camera - all routinely visible at full resolution in listing photos.
The room. Post on a desk, a certificate on the wall, a view out of a window that fixes the neighbourhood.
Why weak covers fail here specifically
Serials and IMEIs are text drawn from a known character set at a known length. That is the case where pixelation and light blur perform worst, because a candidate string can be rendered, blurred identically and compared. If a number is going to be covered in a public listing, cover it with something opaque rather than something smudged.
A practical sequence
- Turn the device off or use a plain wallpaper with notifications disabled before photographing the screen.
- Shoot against a plain wall, not your desk.
- Photograph the box at an angle that excludes the label, or cover the label afterwards.
- Look at each shot at full size for reflections before you upload, not at thumbnail size.
- Strip metadata on export, because a device listing photographed at home carries your coordinates like any other.
After the sale
Wiping the device is a separate job from the listing and the one with the longer consequences. Sign out of accounts before the reset rather than after, and confirm activation lock is cleared - a wiped device that is still tied to your account is unusable for the buyer and generates a conversation you do not want a week later.