Did you first activate your device from SCN on a PC/desktop? (http://scn.sap.com/mobile-preferences!input.jspa)
Alternatively, you can bypass the app and just open http://sap-scn.jive-mobile.com/ on your mobile browser, which is what I do.
Image may be NSFW.
Clik here to view.
Mobile Browsing Using SCN Mobile Apps: iOS, Android, Blackberry
