What's the real difference between iPhone 4, 4S and 5?

The only difference that I can really see is the 4 inch screen but does that really justify someone upgrading from an 4, or 4S? Oh yeah and the processor is slightly faster, but are there any radical changes to the phone like there was between the iPhone 3s and the iPhone 4? Is there someone out there who has an iPhone 5 is it really any difference between that and the 4?

Iphone's aren't as reliable as android phones

I went from iPhone 4 to 5. The biggest difference is the speed capability when going from a 3G to 4glte device on Verizon, the network I use. Siri is on the 5, but not on the 4, which I don't use. Siri is convenient but google voice is even compatible with the iPhone 4 or 5. No jailbreak required! The device is lighter and thinner with a bigger screen. The camera is a little better, but not much. The processor is also a lot faster a4 compared to a6.