Optional ambiguity

A phone number field with the message, in parentheses: "Optional for US"

Source: Leap Motion

If the phone number is “optional for US”, is it mandatory for Australia?

I suspect that Leap Motion in fact only want US numbers. So the phone number is even more optional (is that possible?) for non-US customers. But perhaps the mean that if you are outside the US, the phone number is mandatory.

It’s easy to be unintentionally ambiguous.

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