Yes, you can use an endoscope with an iPhone. An endoscope is a device that consists of a flexible tube with a camera and a light at the end. It is used to capture images from inside small or hard-to-reach areas, such as pipes and ducts. To use it with your iPhone, you will need an adapter that lets you connect the two devices together so that the images can be seen on your phone's screen in real time. With this setup, you'll be able to easily explore dark spaces without having to physically enter them yourself!