File names attached to photos on a desktop computer are helpful when you organize and sort them because you don't have to view the photos themselves for identification. However, the Photos app on the iPhone does not display each photo's file name, even though every iPhone photo has one. You can view these file names either by connecting your phone to your computer or by using one of several apps designed for this purpose.
Use Your Computer
Without downloading or purchasing any apps, use your PC to view file names for the photos on your iPhone. Connect your iPhone to the computer using its USB cable. Then click the Start menu and open the Pictures app. Click the Search icon and start typing Pictures to find the app if it's not immediately visible. In any blank area, right-click and select Import from the menu and then choose the iPhone. Depending on how many photos you have, importing could take a minute or two. When the process is complete, all the iPhone's photos are displayed on your computer with their file names.
If you want to view the file names of photos right on your iPhone, download an app. A few apps capable of revealing photo file names are Photo Investigator, Photo Metadata Reader and Photogene for free, 99 cents and $2.99, respectively. For example, in Photo Investigator, tap the Choose Photo button to select a photo and view its metadata, which displays the file name. Swipe left or right to switch to another photo in your library. Tap Metadata and View to see its file name.