Use a tripod or stable surface
Clean the camera lens
Turn on Night mode if available
Use the widest camera lens
Set exposure to the longest available
Lower brightness by tapping and dragging down on the screen
Use a timer or remote shutter
Turn off flash
Turn off Live Photos
Shoot in a dark location away from city lights
Avoid moonlit nights for better star visibility
Keep the phone completely still during capture
Use a third-party manual camera app if needed
Set ISO as low as possible
Set focus to infinity if the app allows it
Take multiple shots and choose the sharpest one
Edit the photo afterward to increase contrast and reduce noise