We came up with a puzzle for you to solve yesterday and here's the answer - the 13MP image was captured with the front-facing camera of the Sony Xperia X (sans Performance, but the two cameras are actually identical). Clues were abundant - so much so that we resorted to deliberately asking you to ignore them. Well, those who called our bluff were right, there were plenty of correct answers in the comments, but we didn't expect less from our knowledgeable readership. The selfie camera of the Xperia X shoots images up to 4,160 x 3,120px resolution - fairly common for a midranger's...
Source: http://www.gsmarena.com/mystery_phone_revealed_sony_xperia_xs_frontfacing_camera_shoots_great_selfies-news-17759.php