Developing mobile applications with advanced features often requires obtaining user permissions to access sensitive data like cameras, microphones, and location services, which is crucial to respecting user privacy. For React Native apps, the react-native-permissions library by Mathieu Acthernoene provides a way to manage these permissions, as React Native itself does not support permission handling natively. The process involves installing the library, configuring permissions in the app's Podfile for iOS or AndroidManifest.xml for Android, and using functions like request to ask for permissions at runtime. Notably, iOS and Android have specific guidelines and updates around permissions, such as iOS's App Tracking Transparency and Android's one-time permissions introduced in Android 11. The timing of permission requests is a debated aspect of user experience, with some recommending requests at the point of need rather than during app onboarding. The article also highlights the importance of understanding system-specific permission behaviors and offers an example project to help developers implement these best practices effectively.