Welcome! These days on of the most important devices you can use to help with your life is a smartphone. If you already have one, then you will know how important they are. There is so much that you can do with a smartphone and so many different ways in which they play a key role in your life. If you don't yet have a smartphone, then you need to think about getting one.
A quote from Tim Cook (CEO of Apple):
Anything can change, because the smartphone revolution is still in the early stages. Tim Cook, about Smartphone