Default Need Help with Adsense

Starting to do development with android and have follow tutorial on official sites and some off site. I've having a problem with admod not displaying any ads what so ever. Tried using the app on 2 phones as well as a tablet. Still nothing!

I mainly followed: https://developers.google.com/mobile...entals#android

Added the SDK JAR to your Eclipse project.
Declared com.google.ads.AdActivity in AndroidManifest.xml.
Set up network permissions in the manifest.
import the jar
did the build path
Have the admob sdk: GoogleAdMobAdsSdk-6.4.1.jar
Defining a com.google.ads.AdView in XML
added my ad unit : ca-app-pub-XXXXXXXXXXXXXXXX/NNNNNNNNNN

I'm really lost
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