I hate to add more, but I've found that my download speeds are about 500kbs lower when used in my RIGHT hand as opposed to my left. Ive tested it about 10 times or so each hand. Has anyone else tested this. Also, this isn't any type of a "death grip" just the normal way you'd hold the phone when holding it vertically.
I don't see a change (i took my case off) - man, this iPhone 4 is nothing but trouble. Sad, but 2010 is a bad year for apple's iPhone so it seems.