DaStarBuG - 2:47 pm on Jun 4, 2011 (gmt 0)
It most likely will be a long interactive voice controlled version of the AdSense Help site. You will have to go through endless menus and help infos before you'll reach an active human phone operator.
Otherwise Google would receive roughly half a million calls per day all to be handled by humans? Unlikely.
Just check beginners AdSense Forums. Day after day threads like "why are my earnings so low" are posted.
These folks would for sure call Google too