Google Product Forums
Re: Your pages are displaying blank ad units because you haven't yet verified your PIN and/or phone number.
Kukana
May 25, 2012 3:20 AM
Posted in group:
AdSense in English
Categories:
I have an active account: Working with AdSense :
You should have received a PIN on a postcard in the mail, at some point.
If it didn't arrive, or if you lost it, you can request another one.
Here's the troubleshooting page:
http://support.google.com/adsense/bin/answer.py?hl=en&answer=1348257
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