I've been using my iPhone 3GS and my wife has been using her iPhone 3G for quite some time now. My 3GS has been working fine. I'm running iOS 6, and haven't had any problems. My wife's 3G on the other hand has been horrible. She only has iOS 4. Her screen has started looking like an Etch-a-Sketch, she can't even hold the Wifi connection at our house. So, understandably, she's asked to upgrade to another iPhone. I want to go the iPhone 5 route, and she has said she wants to go with the free iPhone 4. But she wants Siri, so I told her to go with the 4S. We want to keep out of pocket costs down as much as possible. Well, she wants to but then she made me feel guilty about spending on the 5 vs. putting money aside for our kids' activities (birthdays, sports, martial arts classes, Six Flags season passes, etc.). For her, is there a big difference between the 4 and 4S?For me, is there a big difference between the 5, 4S and 4? For both of us, would there be an activation fee since we are current AT&T customers, and would be agreeing to new 2-yr contracts? TIA