I am planning to buy a Sony Xperia U because of its plastic design and sheer surface area. It is light and comfortable to hold. One of my friends has bought the same phone and looks really very nice. But before going with the purchase I had a question on the design of the Xperia U. At the bottom of the screen there are three icons in the transparent strip. There are some corresponding dots on this strip. What is the actual use of this strip or else at least make me understand why this strip is kept transparent.
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