(but I bet
my iPhone has more processing power than these machines)
 :o) 
 But why does a phone need it? 
 
    It doesn't need it, as far as you think the phone is just a phone.
    If you think that small slab of power on your pocket is a computer with
    - GPS location
    - Local maps
    - Music player
    - Knowledge navigator (yes!)
    - Videogame :oD
    - Remote control of my media player
    - Portable telephone
    Now you can see it needs it. Of course you can live without all of that.
But it makes my life WAY easier.