Phone cameras have gotten very good but the lenses are often filthy and full of grease which leads to poor photo quality
Your phone naturally picks up grease from pockets and hands and this grease is often visible over time and can affect photo quality
To avoid this, the lens should be cleaned with a microfiber cloth, which should be small enough to fit in your pocket when you go out taking photos and can be easily used to quickly wipe away any grease or dirt
This is especially important for indoor or low-light photography as any degradation in photo quality is more visible in such conditions, so it’s advisable to clean the lens before taking important photos or videos