Some times we accidently delete photos/images from our phone. It is not easy to recover from phone memory. Here is a very nice application, which will help you to download deleted photos from your phone.
Name of this application is "DiskDigger photo recovery". You can recover deleted/lost photos or images with this application easly. The main advantage is that unlike other recovery tools you don't need to root your phone to perform recovery with this app. But if your phone is rooted some deep scanning methods are available with this app. While recovering photos you may see some video thumbnails from your phone.
The application size is less than one Mb. More than one million users are using the application and 4star rated on google play store.I will say that the best photo recovery tool for no rooted device for free is this "DiskDigger photo recovery". The app will work on Android 2.3 and higher versions.