Smart Phone's camera socket
This closely resembles a SlimStack Mezzanine connector from Molex:



Such connectors are often used to connect two PCBs, or a PCB and a flex support. I have seen them in virtually all mobile phones, cameras and even in some MP3 players I have taken apart. They are commonly used to connect IO peripherals like cameras, LCD displays or keyboards. I know about a project where CPU+RAM module is connected in this way to make it upgradable.