My phone- without a doubt. While I love my computer and Xbox and all that wonderful stuff, I do EVERYTHING on my phone- from talking to me wife, to updating social media to updating my websites.
Personal and business is all done on my phone.
Watching YouTube, news, music and even a few games. You literally have the world in your pocket and can track stuff, do research or just be caught up with the world around you.
Plus- how boring would pooping be without it?
Love, Peace and Sharkness