I don't know why they called me and my wife for interview, the agent didn't mention either. It was in SFO office. Just as any fyi, it took me 4 years for GC to be approved. I have been a silent vistor to this site for past 2years and the only reason I registered was because I saw a lot of postings recently where people were getting frustrated. Please don't loose hope, all is well that ends well. May sai help you all.