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Just because there are segments of the population who can not take advantage of a feature at all times does not mean the feature is unwarranted or designed without considering this fact.

> yet more evidence that the iPhone was designed in sunny south California

The evidence is also on the phone itself where it says "Designed by Apple in California"

Noseprint?

It allows for 5 stored "fingers", so you could set things up for each thumb, each index finger and your nose. Assuming there aren't any security issues about using a nose -- and that you're not worried about security much anyways -- you should be golden. How unique are nose prints?

I have once dialled a call using only my nose.