According to the latest reports, LG and HTC will have a sapphire home button with fingerprint scanner on their next flagships. Apple is using Sapphire home button for its iPhone 5S. The reason for that is, Sapphire is one of the most scratch proof materials available on earth and, so it kind ensures that the fingerprint scanner never fails because any scratches.
The rumored devices which may have the Sapphire home button are HTC One 2 and LG G3. This is just a rumor, so there would be no point in blindly hoping for a finger sprint scanner on these devices.
Source: Phone Arena
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