@Markus:
According to my maths (Which may be wrong, it's getting late and I'm half cooking dinner while I try and do this), but using the dpi figures you gave above, and assuming a resolution of 1920 x 1080, I have calculated that you have a 10" tablet (Which I can believe), and a 6.7" Mobile phone (Which is massive! I have a Note 3 and my screen is no where near as large)
>Edit<
I just ran the following code on my Note 3,
// Project: dpi test
// Created: 2017-01-04
// show all errors
SetErrorMode(2)
// set window properties
SetWindowTitle( "dpi test" )
SetWindowSize( 1024, 768, 0 )
// set display properties
SetVirtualResolution( 1024, 768 )
SetOrientationAllowed( 1, 1, 1, 1 )
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
UseNewDefaultFonts( 1 ) // since version 2.0.20 we can use nicer default fonts
dpi#=GetDeviceDPI()
w#=GetDeviceWidth()/dpi#
h#=GetDeviceHeight()/dpi#
ss#=Sqrt((w#*w#)+(h#*h#))
do
print(ss#)
Sync()
loop
And it returned 5.7", which is exactly the size the internet says my phone is (I don't have a ruler to hand either, and can't run off to look for one for fear of burning the burgers)
>Edit 2<
Again, I just ran the same code on my iPhone 4s and it correctly reported the screen size as 3.5"
