Reverse image searching is a powerful tool in the geocache puzzler's arsenal. Finding changed versions of an image, or the source of an image can be very informative. Unfortunately the reverse search feature from Google Images is not available on the mobile version of the platform, meaning that you can't use it unless you are at a regular computer. Thankfully, a tech blogger named Amit Agarwal has built a little Web app to make things easier.
Bookmark this link in your smartphone. Once you have saved an image to either the "Gallery" on an Android or "Photos" on an iPhone, visit this website and upload the image. The reverse image search app runs in your mobile browser and redirects to Google Image search, performing the search for you and getting around Google's mobile limitations.