Can you change photo quality on iPhone?
Go to Settings > Camera > Formats to change the way your device saves photos and videos. Select High Efficiency to save photos in the HEIF format. This tends to be higher quality. Select Most Compatible to save photos as JPEG.
Why are my iPhone photos low quality?
Grain can be caused by several factors including low light, over-processing or a poor camera sensor. The newer models of iPhone have better sensors which is why they tend to look clearer and sharper, but no matter which iPhone you have, there are certainly steps you can take to reduce grain in your pictures.