Received a Call from Google, What might be the reason?

Hi, Today i received a call from Google, but my brother picked the call and asked them to call after few hours. But i didn't get later.

I have given that number Only in my Adsense account, so i believe that the call is from them only. Now i am wondering why did they call me??

Any idea ? and i don't use Adwords.

 

Google called me once to follow up on a survey i did. They also called me once after i went to the "Adsense in your City" party.

 

what is it about ?

 

I also received a call last week. It was from Adsense optimization team. Just discuss about few tips on Adsense placement...Maybe yours also the same case.

 

Mainly about the survey, give idea about the optimization or/and ask for the experience sharing

 

Maybe is about survey on adsense?

 

Google frequently calls, no issues at all.

I received a call last week from them and they were asking me to use their adwords service. They also sent a adword coupon along with adsense check last month.

 

Hmm.. May be a survey, I guess.

 

As my bro asked them to call later, till now i didn't get any call from them. I was worrying if it was anything related to my account

Thanks for All Replies