Very rarely--though still often enough for me to be a little weirded out by it--my iPhone displays some sort of "greeting" messages when I press the sleep button to wake it up. Here's a screenshot of the most recent one: There have been other messages that say things like "GOODNIGHT" and "HAPPY VALENTINE'S" I think(?), all in white text with just the "Dismiss" button at the bottom and a blank black background. It doesn't do anything malicious, in fact it doesn't affect my iPhone at all (at least, not to my knowledge). I was just curious as to what it was and if anyone else was getting these greetings from their iPhone at random times.