Facebook supports a diverse audience around the world and an equally diverse set of devices.Today Facebook releases free collection of mockup devices (Apple, Android and Windows smartphones).
Each device comes with a bitmap of the device (with and without shadows) and the original Sketch file for that device.
Facebook will release different categories of devices for digital platforms such as TVs, tablets and wearables in the future. Likewise, this list will grow and change as new devices come into use.