The Nexus 5 was named by us as one of the best smartphones of 2013. Released last October, the handset remains relevant and fresh today, and can even match up with the new flagships that are currently rolling off assembly lines at Samsung, HTC and LG. The phone is presently running Android 4.4.4, although the last update was send out as a security fix.
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source: Google via TuttoAndroid (translated)