I just recently ditched the Iphone 4G for a Thunderbolt and while the Thunderbolt is not my favorite phone, the large screen is much more vibrant than my 4g ever was. I consistently found myself enlarging the page/picture/map on the iphone to see what I was trying to do but, on the Tbolt I rarely have to do this. Almost everything I view on the Tbolt is vibrant and is it is not necessary to "enhance". The small screen on the Iphone makes it feel and look like a "Toy"!