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We had this debate when the iPhone 3G came out and the 1st Gen iPhone was around. So many apps that used the Accelerometer required flat a surface. Yet it was a concave plastic enclosure back then.


Functional, yet non-flat.
 
It desn't make any sense to have it convex. If it were a biometric sensor, it would be very difficult to center a finger on it. It also exposes the button to damage - sapphire or not (things will get caught and do their best to pry it up or push on it sideways).
 
It seems to make more sense, since your finger will encompass it when you press down, but I do agree that it may just be speculation.

I'm no fingerprint expert though, so my assumptions might be way off technically.
 
Just symmetrically speaking seems odd to put the phones screen-side down and not have it lie flat.
Symmetrically? Seems like an odd basis to me. Wouldn't the home button (or any feature found on the front but not the back) be "odd symmetrically"?
 
If it is convex, the button would never rise above the surface of the phone. It would have to start concave and curve around to a convex as in my depiction here. I would assume the square would not be present due to the sensor. Maybe an ourter glow ring?

rw57vb.jpg
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