The tutorial provides a comprehensive guide on implementing remote push notifications in a React Native app for both iOS and Android platforms using a PubNub-powered IoT smart button and a Smart Doorbell app. It outlines the necessary steps to set up the environment, including creating an IoT smart button with a push button and an AMKR1000 development board, and completing a Smart Doorbell app that tracks button press events. For iOS, it details the requirements of enrolling in the Apple Developer Program to obtain API keys and configuring push notifications using Xcode, while for Android, it describes using Firebase Cloud Messaging and configuring necessary permissions in AndroidManifest.xml. The guide also explains how to send notifications through PubNub by publishing messages with push notification keys and provides instructions for testing on both physical and virtual devices. Additionally, it offers suggestions for modifying the IoT smart button to trigger push notifications and explores potential uses for mobile push notifications, such as alerting users about delivery locations and promoting offers.