Like the first Ubuntu OS phone, the new BQ Aquaris E5 HD Ubuntu Edition is based on an existing Android handset, with a 5-inch 720p display, 1GB RAM, 16GB storage and 13MP camera with dual-LED flash.
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The world's first Ubuntu phone is just a variant of an existing low-end Android phone, but it's already picked up some carrier support - although perhaps not quite in the way that you were expecting.