Google Tag Manager enables developers to change configuration values in their mobile application using the Google Tag Manager interface without having to rebuild and resubmit application binaries to app marketplaces. Google Tag Manager is useful for managing any configuration values or flags in your application that you may need to change in the future.
Prime31 are a series of pluggins that let you implement the Unity programme into your iOSapplications. Prime 31 is well documented and requires you having Xcode closed the first time you build your project. It is required you do a Build (not a Build and Run) or your Xcode project may not get setup properly.