Introducing the first two handsets of Acer's 2013 line-up: the Liquid E1 and the Liquid Z2. The company formally announced the Liquid E1 last month, but with Mobile World Congress around the corner, the mid-range phone just got official for the European market. The E1 packs a dual-core 1GHz processor and runs Jelly Bean on a 4.5-inch qHD display -- and, notably, it will be available in both dual- and single-SIM configurations. Acer is marketing the E1 as a multimedia-friendly handset, and accordingly it includes two speakers with DTS Sound, plus "Float" software that prevents notifications from popping up when you're watching videos. The Liquid Z2, on the other hand, is an entry