"The Wireless Mobile Adapter Utility Application must be installed on the smart device before it can be used with the WU-1b Wireless Mobile Adapter connected to the Nikon D600. The application can be downloaded free of charge from Google Play™. for use with an Android platform smartphone (2.3 series or later) and tablet (3.0 series or later). For the iOS mobile platform, the application can be downloaded free of charge from iTunes® online store on September 15, 2012 for use with iOS version 5.1 or 5.1.1."
Update: here is the Nikon WU-1b wireless mobile adapter filing at the Indonesian Communication Agency:
Update#2: the nikonusa.com website is now updated, here is a screenshot of the original page with the D600 reference: