Quick question, preordered 2 S6s, one for me other for spouse and now I need to get car chargers (for 2 cars). I see a lot of dual port quick chargers on this site and amazon however I can't tell if both ports can do the quick charge at the same time or is it just one phone can quick charge while the other is regular charge. I realize that the increase in power output may necessitate having only one port perform quick charge at a time but am curious if one exists to do both phones?