Why do my phone photos look worse than they used to?

Image quality does not degrade gradually in software. If your photos are genuinely worse than they were, something physical has changed in front of the sensor or in the mechanism behind it, and each of the three causes looks different in a test shot.

What you'll need

• A bright point light source, such as a torch or a streetlight
• A microfibre cloth

Step by step

1. Rule out the two-second explanation first.Clean the lens covers properly with a dry microfibre cloth, both the main and the ultrawide. Skin oil builds up as a film rather than a smear and you will not see it by eye. Re-test before going further.
2. Take the flare test shot.In a dark room, photograph a torch or a bare bulb near the edge of the frame. A clean cover gives one or two neat flare shapes. A scratched cover throws fine streaks radiating from the light, and a halo of haze around it.
3. Understand why scratches show up late.A sapphire or glass cover accumulates hairline scratches from grit in pockets and on tables. Each one is invisible individually. Together they scatter light, which lifts the black level and kills contrast — visible first in backlit and night shots, months before you notice it in daylight.
4. Check for condensation and trapped moisture.A soft milky area, worst in one corner, that improves after the phone has been in a warm dry room for a few hours is water vapour behind the cover. It gets in through a seal that has aged, or after a soaking, and it can leave mineral marks when it dries.
5. Test the stabiliser.Rest the phone on a stack of books and take a photo in dim light. Then take the same shot handheld. If the supported shot is sharp and the handheld one is smeared, the optical stabiliser is not doing its job. A failing one often makes a faint rattle or buzz when you shake the phone gently near your ear.
6. Check whether one lens is worse than the others.Shoot the same scene at 0.5x, 1x and the telephoto. Degradation confined to one focal length is that specific module. Degradation across all of them is more likely a setting, a screen protector overhanging a cover, or a case edge intruding.
7. Look at the case and any protector.A case lip that has shifted, or a stick-on lens protector that has picked up its own scratches or lifted at an edge, produces exactly the haze people blame on the phone. Remove both and re-shoot before concluding anything.
8. Decide what is worth fixing.Lens covers are usually part of the camera module or the rear glass assembly, so replacement is a real repair rather than a part swap. On an older phone the sensible options are living with it, using the least-damaged lens, or putting the repair money towards the replacement you were going to need anyway.

Tips

• Backlit shots and night shots reveal a scratched cover long before daylight shots do. Test in those conditions, not on a bright afternoon.
• A stick-on lens protector is a consumable. Replacing a scratched one is cheap; replacing a scratched phone lens cover is not.
• Do not use a cloth that has been in the same pocket as the phone. It carries the grit that caused the problem.

Common mistakes

• Assuming a software update ruined the camera — Processing does change between updates and occasionally for the worse, but it does not create radiating streaks around lights or a milky corner. Those are physical. Run the flare test before blaming the update.
• Cleaning a scratched cover harder — Rubbing grit across glass adds scratches. If a gentle wipe with a clean dry microfibre does not fix it, more pressure makes it permanently worse.

If it doesn't work

Questions people ask