My experience with the Galaxy S5 finger scanner has been patchy to say the least. When I first used the device at Mobile World Congress I found the scanning process quite clumsy and inaccurate and didn't think I'd actually use it. Then when we got a review unit I used it more and found it to be more accurate and didn't mind it so much. Then I tried to shoot this video and it all went pear-shaped. Here's how to use, and not use, the Galaxy S5 finger scanner.
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