An FYI for those who haven't played the game yet. The unlockable voice lines are just one liners that are really just there for humour. The meaningful voices like Need Healing/Ultimate Charging/Group Up/Thanks are all available by default. The only exception is that some characters like Winston and Mei have a "Sorry" voice line you can unlock, so I can see how that can be useful in gameplay. Outside of that, it's all stuff that's just there for shits and giggles.