One of the benefits of the smart phone generation is the ability to buy a cheap, wireless borescope or endoscope and look into places that your body does not want to go, or where access is dark and inaccessible.
The first one I had was not wireless and had to be plugged into the phone, but the current one that I am using does not have to be attached to the phone which makes it easier to use...It's amazing how good the cameras are for the price. Technology is worth it sometimes...