Cell phone photos aren't always of the best quality. Sometimes the color is off, or it's a touch blurry. I often transfer my photos to my computer and edit them with Photoshop. In case you don't have access to the program or just need to make a quick edit, there's the Photoshop Express app. I like to use it mostly for sharpening, reducing noise (graininess), or lightening shadows. The best part is that it's free.