The British actor, who plays Jon Snow in the fantasy Tv series, was relaxing at a bar in the capital ahead of promoting his new movie Pompeii when his cell phone was pinched from his table.
He is now panicking about what the thief will do with its contents, saying, "It was nicked from a table of a pub I was in over in Battersea, London.
"I was gutted as I had to go away for work the next day and had no way of contacting people. Apple have assured me they've locked it, but I'm not so sure.
"When you end up seeing all my personal photos on the Internet, you'll know why. It also had all my contacts' details in there too, so there's a lot at stake."