Hi! I have a new iPhone 4 16 GB! It just amazing. Like iPhone 3G, but better, more beautiful and fasterrrrr. Now, I have a big doubt. Should I use a screen protector? I had a 3G for 18 months without it, and it just has two minor and invisible scratches. And the other thing. If you put 3G along to an iPhone 4, the iPhone 4 screen looks more yellow than the 3G. It's not yellow tint, the white is more yellower. It happened the same with the 3G and an iPod Touch.