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 Help Forum

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.