Extremely recently, Nintendo launched a Smartphone browser compatible version of their Miiverse Social Network. Nintendo are yet to launch a native app for Android or iOS, however, one developer has taken the matter into their own hands.
The unofficial app is available to download from the Google Play Store and it's expected that we'll see something similar arrive on iOS. The app includes all the functionality of the web version of Miiverse along with some bonus video content.
If you're not to keen about installing a third party app, check out our handy guide that explains how you can add the service to your Home Screen. We suspect that Nintendo will launch native applications for the Miiverse very soon.