Requirements for the project
ARKit requires an iOS device with an A9 or newer processor, as you cannot run the AR project on a simulator. So, you will need at least an iPhone 6s to run the project.
ARKit is a feature of iOS11, so you will need the latest version of Xcode 9 to develop AR applications. Xcode version 9.2 is available to all and can be downloaded from the Apple Developer website.