What happened to the message sent by iPhone4? Maybe I accidentally pressed it. I don't understand. Please tell me how to get it back.

IPhone has its own gravity sensing, so if the machine comes sideways, the interface will also come sideways ~ You can try to hold the phone vertically and use the vertical screen ~ If you want to lock the vertical screen (cancel the horizontal screen), double-click the HOME button (the round button on the main screen) and then slide to the left, there is a vertical lock, just click it ~ I hope my answer can help you ~