The Lumia 550 is said to look almost 'exactly like' the 640 it will replace, featuring a HD AMOLED screen, metal bodywork elements, 4G LTE connectivity and a front-facing LED flash for the selfie-cam.
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These are the four codenames associated with a bunch of new devices that Microsoft is working on. By the looks of it they're all Lumia handsets, destined to launch alongside Windows 10 Mobile.
