HTC Diamond Color on the back end.
On the other hand if I were you I would get the Touch Pro. Not only does it have a flash, but it supports up to a 16GB micro SD card, and it has a full keyboard, and better battery. It is the Diamond on steroids. I wish they would have just put the Touch Pro out that way it would seem a little nicer to be the Advocate @ Sprint. I do like the Diamond for free, but a burgandy back no flash and crapy battery with only a 4GB internal memory is sorry compared to the PRO. 😕 The touch pro is going to be the best phone Sprint ever had trust me when I say it is the BOMB!!!! Googl touch pro and see what I am talking about.