I think my i4S is going to have to go back. Don't get me wrong, it's a fantastic phone. It's definitely a bit snappier than my i4, the reception is improved, and of course the camera is a bit nicer. To be fair, I never had a problem with the speed, reception or camera on my i4, but any improvements are welcome. So why is it going back? Well, the screen is a disappointment. It has a yellow tint and the contrast is weaker, making all colours (not just white) look flatter and less impressive. Yes, I'm sure I will get used to it in time. It's not terrible. But considering the i4 was marketed primarily on the quality of its IPS screen, this is a step backwards - something one doesn't expect at this price. When I think of how much time I will spend looking at this screen, writing and reading texts and emails, surfing the web, playing games, admiring my photo albums or the latest movie trailer... I realise how much more important the screen quality is to me than a small speed bump, or even Siri (as fun as she is). Additionally, I can no longer turn off 3G on the i4S, which is going to really effect battery life considering I prefer to leave it off. So those are my reasons, like 'em or not.