You carry the whole world in your pocket.
I have a Samsung Galaxy S7 and I'm still getting used to the idea that I can carry a library with me. And getting over the surprise that reading a whole novel on a screen that size is no hardship at all.
what is advantage of mini computer?
You can carry it everywhere you go.
We can take it with us when we need it for writing or contacting to friends, search somethings when we need, watch the movie, listen to musics and chat with family when we go travelling etc.