I'm in the market for a unlocked iPhone 4, but I haven't decided if I want a 4 or 4S. I make calls, text, email, web browse the most. Simple gaming (card games). I only use the camera for snapping photos to help with price checks while shopping or snapping photos in antique shops. I have an iPad 3 with Siri now and hardly use it. I would be using it with my unlimited data plan on T-Mobile. I've used a 3GS in the past, but currently use an Android device with a custom rom. I'm aware one is dual core while the other is single. Aside from that, do you see any big GUI speed differences between the two devices when using iOS 7? I don't think what I'm doing is going to take up massive amounts of graphic processing power.