I own a galaxy S7 which has a 5.1'' 16:9 screen.
The original Nintendo DS (and DS Lite) has a DUAL 3.1'' screen but it has a 4:3 aspect ratio.

Putting these numbers in this website: http://www.displaywars.com shows the image on bottom of this post.
Soo... does it means my 5.1'' 16:9 screen Galaxy S7 can perfectly fit two 3.1'' 4:3 screens and a little more?
I was messing around playing some games with the vertical orientation but I thought everything was so small so decided to research these things, haven't touched a DS for some years so my memory is not helping....

http://www.displaywars.com/5,1-inch-16x ... d%7B3x4%7D