B2G 2.2 20141101040202 on Flame (v188 base image) There is a black bar at the bottom of the screen to unlock the SIM with the PIN. It overlays/crops buttons the buttons for skipping the screen or confirming the typed PIN. I can't provide a screenshot because that shows up fine (I can see that the visible area gets extended when the screenshot notification scrolls down, but that should be after the screenshot has been taken).
Maybe a duplicate of bug 1092543. Anyway, it's now a Worksforme with B2G 2.2 20141111040202.