VideoMic Me Mini Directional Mic for iPhone and iPad
This is the latest addition to the Røde line of mics. This high quality Røde directional microphone connects directly to the iPhone TRRS microphone/ headphone socket. There is a flexible mounting bracket suitable for wide range of smartphones. It can be fitted for primary camera or front camera ('selfie') use
Below are a product demonstration from News Shooter and Røde and a link to where to buy. The Røde website cautions that some products sold through a U.S. Amazon reseller have been fraudulent.