This is a post from the Samsung Tomorrow Blog about some not so well known S5 features:
1. You can write on it with a Pencil
The touch sensor on the Galaxy S5 is so sensitive that it can even recognize it when you’re tapping, swiping or writing on it with a pencil.
To use your smartphone like this, go to Settings, then Display, and then tick the ‘Increase touch sensitivity’ feature or select ‘Touch sensitivity’ among the 22 quick menu icons by pulling down the status bar with two fingers. Now you can instantly send text messages, send files, and take pictures with your fingers, a gloved hand (which we’ve already introduced through the Galaxy S4 and Note 3), your fingernail or, that’s right, even a pencil!
- See more at: http://global.samsungtomorrow.com/?p....p06sB3st.dpuf
Hope that helps!!