Apple declares for iPhone (not retina display) 163 ppi but if you use below calculation
http://en.wikipedia.org/wiki/Pixel_density#Calculation_of_monitor_PPI
the result is 164.825201164068.
What calculation uses Apple for it?
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The resolution is exactly 163 ppi if you assume a diagonal of 3.5392 inch, and that is probably within the manufacturing tolerance, so I assume that Apple specified the lowest resolution that is possible within the tolerance.
Martin R
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