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The Samsung Galaxy S Relay 4G is an Android touchscreen slider smartphone designed and manufactured by Samsung for T-Mobile USA. It resembles the Samsung Epic 4G in appearance and shares the Epic 4G's screen and camera specifications, but the CPU and other internal hardware is more similar to the Samsung Galaxy S III.
Newer competitors include the BlackBerry KeyOne and BlackBerry Priv. As well, official and unofficial external keyboards are available for some Samsung Galaxy devices, including the Galaxy Note 5, the Galaxy S6, the Galaxy S7, and some newer phones. Samsung calls its official external keyboard a "keyboard cover".

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