How did my Mac end up with iPhone 4S as my host name in the user prompt in OS X terminal?
It turns out it was just as our Unix guy had said.  The iPhone4s Host name is only present when I am at work and my mac book is accessing the companies wireless network. When I am away, the terminal shows the proper hostname. We are a mac centric company but we use all windows servers. Apparently, that makes a situation ripe for these strange DHCP anomalies.

Thanks for the help.