This happened on someone else's phone, and flickered on then off too fast for a screenshot. This was in the Savannah area of Georgia. My daughter's best friend was talking to someone who, incidentally, has been having a lot of trouble with his phone lately and often messed up internet ( me too. In AZ) in the middle of talking, his screen went black, then on the lower half, appeared a big red Q!! Then it disappeared! I take this as a good omen. Even if it's a hacker or something.