Use the Light That’s Around You…
The iPhone doesn’t have a built-in Night Mode — at least, not yet. (But we’ll get to that potential feature later.) In the meantime, you’ll have to work with what you have. So, to get the best low-light shots, try to avoid shooting in total darkness.
Instead, look for any available light close to your scene. Street lamps, car headlights, candles, illuminated storefronts, and so on. You may not get a clear-as-day picture, but shooting based on these alternative lighting sources could result in some cool and abstract pictures.