Forget passcodes or fingerprint scans. Now you can unlock a smartphone with the blink of an eye.

Japan's largest mobile carrier, NTT Docomo Inc., on Wednesday unveiled a smartphone that uses an iris scan to authenticate the user and unlock the device. Docomo said the Arrows NX F-04G, which uses Google Inc.'s Android operating system, will be the world's first commercially available smartphone with the feature when it goes on sale later this month.

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