Nintendo have soft launched the Online App for Switch on Google Play and iOS today.
The app allows for several new features, most importantly voice chat for online games like the forthcoming Splatoon 2. It also lets you manage friend invites and setting up online games.
The blurb on Google Play says “The Nintendo Switch Online app is designed to help enhance your online gameplay experience on Nintendo Switch™. With this app, you can check game-specific services (e.g., SplatNet 2 for Splatoon 2), invite friends to play with you via social media, and use voice chat while gaming.”
There are server errors after you log in at present, though these are expected to be fixed before Friday’s Splatoon 2 launch.