Can plugging a Galaxy S6 directly into the outlet short circuit it?
With any power surge it just depends on how bad the power surge is. But yes. It is possible for a power surge to go through a charger and damage the phone. My suggestion would be, Buy a travel size surge protector to carry with you if you are really worried about it. Or buy one of those power banks and charge your phone off of it. Now a days you can pick up a 15,000 mAh one pretty cheap. With a 15k one, you should be good for at least 4-5 charges(since most banks arent 100% efficient) on the S6 since its battery is only 2550 mAh.