The numbers are from IDC, so they might not be very accurate. According to IDC, Samsung sold 2,391,000 tablets worldwide in Q2 2012, but according to Samsung's court documents in the Apple case, it sold 37,000 tablets relevant to the court case. It could be that almost all of their sales were international and/or not-relevant (such as Windows tablets), but it is hard to reconcile those numbers nonetheless. The most likely explanation is that IDC really sucks at estimating tablet sales. Maybe they are dramatically better at phones?