WP7 AdMob No Requests

I'm trying to implement the AdMob SDK into my WP7 app.开发者_Python百科 I followed the directions, but I don't get any ads, not even test ads. I traced the network traffic with fiddler and see that the AdMob JS is downloaded, but I never see any HTTP requests for any ads. Anyone see this, or know how to fix it?

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looks like it's kbown problem, try 3G

http://groups.google.com/group/google-admob-ads-sdk/browse_thread/thread/68ea6c16b194bc1f/26f2232a7681f786?lnk=gst&q=phone+7#26f2232a7681f786