What does the '?' or 'i' button do?

You may press the blue " ? " (information) button and then any other feature of the phone (e.g., phone button or softkey) to get more information about that key. For example, if you press the " ? " button then the "settings" button, you will see information about the settings button functionality on your phone display. Some older phones may have a blue "i" button instead of the "?" button.