I have a 4S, I'll be on my Wi-Fi and go on YouTube for awhile. Out of random I switch to 4G and it wouldn't tell me. I would just keep watching YouTube wasting my 4G. I got a message saying I used 90% of it. My god! How is this even my fault! Why does it disconnect on its own. When I go to switch back to Wi-Fi it says the thing is on to join the Internet. It would be on 4G if it was off so I could tell it disconnected. Now I'm paying for something that's unfair. It sounds like they are scamming money from me. Making me pay more by being on 4G For a long time until I switch it back. Wtf! Will there be an update or something. Someone should complain or something because I'm not the only one I'm sure of it.