I don't think it's hyperbole for me to say that the world changed 8 years ago when Apple and Steve Jobs introduced the iPhone. If you've never seen the video of the keynote, you really should watch it. It almost feels as though it's our cultural duty in 2015 to watch this video in order to understand why the world is the way it is today.
Jason Snell has some great advice:
If you’d like to hear some fantastic analysis of the event, I highly recommend episode 30 of The Prompt, in which Federico, Myke, and Stephen break down the entire event, complete with clips.