How to Make Phone Calls on Web, iOS and Android with Ionic

The tutorial covers building an Ionic app that allows users to make calls across three platforms (web, iOS, and Android) using the Vonage Client SDK. The project uses React as a frontend framework. To complete the tutorial, developers need a Vonage API account, Xcode 12 for iOS development, Android Studio with JDK 8 or newer for Android development, and Node.js installed on their machine. They also need to install Ionic and its dependencies, set up environment variables for Android development, create a Vonage application, generate a JWT for authentication, and configure the NCCO for making calls. The tutorial provides step-by-step instructions for running the project on each platform, including web, iOS, and Android, with minimal code changes required between platforms.