I'm trying to figure out the complex matrix of the new Messages iOS 6 app. So many "if-then" situations that determine when it's an SMS or when it's just a "chat" through an internet connection. Has anyone found a good resource explaining this? In particular, I'm using my iPhone 5 without a texting plan, but I still want to be able to chat with others who may be on their computer. Am I locked in to only sending/receiving SMS when I'm on 4G or LTE? -Kevin PS: I somehow thought the new Messages would allow me to chat with AIM contacts, like Messages did on Lion. Maybe Apple should have chosen different product names because now I expect the iOS Messages app to act like the Messages program I installed in Lion on my MBP.