Fitting Unity 2D Mobile Game in all mobile Screen

I am trying to make a 2D landscape game for android in Unity 3D,but if I make my game scene fit for one setting lets say 1280*800 the when I install it in a device with different aspect like 800*600 ,not all scene is displayed for some screen extra blue space is displayed..

If somebody knows please tell how can I scale my game o fit in all mobile like most of the games do .. I tried Matrix Projection,setting orthographic size of camera ,setting aspect ratio,making child of an GUI element.But nothing seems to solve my problem. Please Help