Yes I can tell you as I was a passenger on this flight. An iPhone got trapped in Club Class Business seat and started smoking, we were approaching the Artic Circle and as the phone could not be removed from the seat the Captain was concerned it could become a fire, so we made a 1.5 detour to Anchorage where US Immigration would not allow us to deplane, and as the crew would not have enough hours to reach LHR after being 2 hours on the ground whilst the phone was removed were sent to Toronto and I transferred to the 18.30 to LHR. It was a very long day!