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Re: back cover
Those are for the various antennas in the phone.NFC and cellular radios.When you take your cover off you'll notice several metal contacts arrayed around the edges on the back of the phone.look at the back cover and you'll see they align with the metal strips on the cover. This allows for better reception of outgoing and incoming calls and data.Its also why the cover is plastic and not metal like the bottom of the phone.I have a Asus Transformer Prime. It has a lovely all metal back but it has poor GPS and Wi-Fi reception because of it.
Originally Posted by Nyboiswagg