I called IIO twice... (my experience)
For whatever it\'s worth...
My lawyer from Fragomen, specifically asked me not to call IIO\'s. But I called twice, once in March and once in May. When I called in March(first week), I was told that background check everything was done for me but it wasn\'t assigned to an officer.
Later I called on May 10th and I was told (exact words) "Officer working on your case hasn\'t given any decision yet on your case". Later the same evening when I called at 9:00 PM, heard the magic words "This case is approved as of May 10th".
Good Luck to u all...
Ram.