Well, the reason Apple takes a little longer to release sim-free iPhones is the scalpers from abroad. Let me explain how the rich "black market"
works outside US: Apple releases iPhones in September in US, and as everbody knows there are no enough iPhones for everybody. Intentionally
or not, the demand is always higher than the supply. While a couple dozen countries get the first, second and third wave of launches, there remain
more than 100 countries without iPhones - and an eager damand in those countries to get them. So what Apple does is to put an obstacle to avoid
the famous lines in front of Apple store to be made of - only - scalpers from abroad. Then, when everybody, or almost everybody gets their iPhones in US, then Apple releases the unlocked iPhones to - mainly - US customers. But then the scalpers get step into the stage: I have friend from Brazil who
travel to Miami only to buy unlocked iPhones for $649, just to sell them for around $1,200. I have a friend who bought an ultra-lux apartment only
with this scheme. He sells around 400 iPhones a year. All of them bought in Miami and sold with a margin of more than $500 dollars. Brazil now
has two Apple Stores, going to the third one. But it takes so long for us to get the iPhone, that we actually are thankful to the scalpers. Even with this
absurd price, that's how a vast fraction of iPhones get into our hands: scalpers. In reality, US customers should be considerate to Apple, for it postpones the release of unlocked iPhones every year to avoid iPhones getting into the hands of scalpers instead of US customers. BTW, it takes so long to iPhones reach Brazil and other countries due to import barriers.