True Tone on iPhone adjusts the color and intensity of the display to match ambient light, making images appear more natural.To enable True Tone on iPhone, go to Settings > Display & Brightness and turn on the toggle next to 'True Tone'.To disable True Tone on iPhone, go to Settings > Display & Brightness and turn off the toggle next to 'True Tone'.True Tone enhances viewing experience, reduces eye strain, affects battery life, and adjusts display brightness based on ambient light.