original source from Daum (in Korean):
LG
LG may already be testing Nexus 5 prototype after all. Sold 3 million Nexus 4s to date ? Unwired View
LG
LG may already be testing Nexus 5 prototype after all. Sold 3 million Nexus 4s to date ? Unwired View
According to popular Korean site Daum.net, which does get quite a few Korean gadgets right, LG?s Mobile Communications division has already produced a prototype Nexus 5 device. The next generation Nexus has been in testing inside LG for the past month, under very strict security conditions, and has already been shown to Google?s CEO Larry Page.
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Daum also mentioned that according to the sources inside LG, 3 million Nexus 4s have been sold to date.