> Plenty of models that can work with all frequencies, so I am not sure if that's enough of a justification. Only some chipsets work with all frequencies and w

> Plenty of models that can work with all frequencies, so I am not sure if that's enough of a justification. Only some chipsets work with all frequencies and when 90% of the population of the planet all use the same settings why spend the cost to cover the other 10% which would double your chipset costs but would unlikely increase sales. Americans bully each other over the colour of their chat bubbles because apparently not buying iPhone makes you appear poor. There are lots of justifications to avoid increasing costs to try selling to the Americans.