Learn to build a video and voice calling mobile application for iOS and Android using React Native in this comprehensive tutorial. Follow step-by-step instructions to create a fully functional app with features like authentication, contact list management, call initiation and reception, video and voice-only calls, and navigation. Utilize Voximplant cloud technology to power the video calling feature, and gain hands-on experience in React Native development. Explore topics such as initializing a project, rendering contact lists, implementing search functionality, designing calling screens, handling incoming calls, and setting up app navigation. Suitable for beginners, this tutorial covers everything from project setup to advanced features, culminating in a professional-grade video calling application.