All 3G enabled Samsung Smart phones have a front camera for video calling, but how do you turn it on. Well, I am not sure if you can click pictures with the front camera or not, but u can sure activate it with a simple code.
In any Samsung Smart phone and type *#0*#. You should see a LCD Test Screen appear, choose the VGA/CIF Cam (as the case may be) to activate it. I doubt you can take pics with it, but I am sure you can have a lot more fun with these hidden menus.
To go back press the home button or end button on your phone.