If you want to watch a GIF you've saved to your iPhone, you've thus far been mostly out of luck. In order to watch that urban samurai GIF on your phone, you need to drop it into an iMessage, or view it on the web. Photos+ is a new app for iPhone that builds on the features present in Apple's stock Photos app with some key new features, including GIF support. The app presents your photos chronologically in a full-screen mosaic view, and lets you play GIFs by tapping on them. It's on sale today for $2.99 in the App Store.