Yesterday's findings of folders make it certain that the iPhone 5S has a fingerprint sensor. I already see the competition scrambling to change upcoming smartphones to add fingerprint sensors to compete with the iPhone 5S this fall.
It has been already rumored a long time that Apple is going to integrate a fingerprint sensor in the iPhone 5S. The company has bought a fingerprint sensor company called Authentec to get the technology. Yesterday a folder found in an iOS 7 beta release confirms that there will be indeed a fingerprint sensor in the iPhone 5S.
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How it will work is not clear yet. Ideally the sensor works through the screen. Apple has filed a patent describing this. The alternative is to have the sensor inside the home button.
To lock and unlock the iPhone via a fingerprint scan is going to be making owning an iPhone more secure. I am never using the passcode feature because it is a pain to enter the code each time I want to use the iPhone. If the fingerprint scanning works fast and reliable it will be great new iPhone feature that other smartphones will be definitely want to match.
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Most likely Samsung will show a fingerprint smartphone even before Apple will reveal it this fall.