Just about every phone I have will give a notification of a new text while locked. I know the iphone goes one step further shows a preview and who it's from. For privacy reasons (work and personal) I might not want people to see who is texting me or what it says. I would like a simple message saying "2 new messages", or "1 missed call" on the lock screen, so I do not have to unlock it every time to check. How do I do this?