Phone types: Android, iPhone 5, 4S, 4, other camera phones
Starting price: $20
These four lenses—fisheye, telephoto, wide angle, macro—improve shots taken with almost any camera phone. The lenses use a detachable magnetic ring to match up with your camera's built-in lens. Each lens is sold separately for $20 each (fisheye is $25), but you can buy the entire set for $49.