The Original iPhone
The original iPhone came in one color: Black
The original iPhone was only available on AT&T Service. The original iPhone was rounded and worked on iOS 1. The iOS was a different look and feel from what we use today. All of the apps were web apps or Websites designed to work on the iPhone. There was no iPhone App Store and you were not able to send MMS. The first update was to iOS 2 which introduced the App Store onto the iPhone.
The original iPhone originally came in sizes 8GB, and 16GB.
This phone is no longer available. The last iOS it was able to update to was iOS 3.0.
You can find an original iPhone on ebay.
For more information and technical specs you can view this site
Updated 10/26/15