That got your attention!! 
Something I'd not seen until just now (upgrading my 4S to 7.1); when a window came up showing 'verify update', I started tipping my phone towards and away from me (as you do!) while looking at the screen and noticed that the window was 'in front' of the underlying background text, in that there was noticeable parallax between the two, making it look like the message box in front was about 1mm forward from the background text. Does the screen has 2 planes or am I just being stupid?
Something I'd not seen until just now (upgrading my 4S to 7.1); when a window came up showing 'verify update', I started tipping my phone towards and away from me (as you do!) while looking at the screen and noticed that the window was 'in front' of the underlying background text, in that there was noticeable parallax between the two, making it look like the message box in front was about 1mm forward from the background text. Does the screen has 2 planes or am I just being stupid?