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6) Use environmental light to your advantage

Small lighting changes can make a big difference in your final image. When taking photos in low light, use whatever light that actually is available to illuminate your subjects.
13 Tips for Shooting Low Light Photos on your Phone
Brighter objects show less noise, so if photographing people, make sure the light is hitting their face, not their backs – it can be as simple as asking someone to turn their body slightly to the side.