Using the Prairie Fire air-to-air missiles, like the Sidewinder and Sparrow, in the Phantom is still very awkward/difficult.
Upon using the switch target, or lock/reveal target button, nothing will happen. I believe that it is something to do with the Phantom itself, as equipping these missiles on the pylons on aircraft such as the buzzard, neutralises this issue.
EDIT: On an unrelated note, the angle of attack always seems to display 0 unless pulling high Gs, I believe that this may be displaying incorrectly.