To use Night mode on your iPhone, follow these steps:

1. Open the Camera app and switch to Photo mode.
2. Night mode will automatically activate in low-light conditions. You will see a moon icon in the top-left corner turn yellow when Night mode is active. If it's not yellow, tap the moon icon to enable it.
3. Tap the shutter button and hold your iPhone steady until the photo is captured. Keeping the phone still is important to avoid blurriness since Night mode often uses a longer exposure.
4. You can adjust the exposure time by tapping the arrow at the top of the screen or swiping up on the preview, then tapping the moon icon again. Use the slider to set how long the camera should take the shot, with options ranging from 1 to 30 seconds depending on the environment.
5. Using a tripod or placing the phone on a stable surface helps improve photo clarity during long exposure shots.
6. For best results, incorporate ambient light, avoid digital zoom, and keep your iPhone steady.

Night mode is available on iPhones 11 and later, with some advanced Night mode features on Pro models and newer devices. The camera automatically detects low light and switches Night mode on, so there is no separate setting in the iPhone settings app for this feature. If you want to turn off Night mode, just tap the moon icon and a line will appear through it, indicating the mode is disabled. This feature also works with front-facing cameras for Night mode selfies on supported models. In summary, Night mode on iPhone:

• Activates automatically in low light
• Allows manual exposure time adjustment
• Requires steady hold or tripod for best photos
• Enhances low-light photography with longer exposure times

These instructions apply for iPhone 11 and newer models with iOS 14 and later.