Sony Xperia Z4 is official: slimmer, 64-bit octa-core and more, out this summer

It's official, Sony has quietly unveiled is Xperia Z4 smartphone in Japan. The Sony Xperia Z4 was delayed for release at Mobile World Congress in Barcelona, says Sony in Japan. Hence the quiet release. So what's new? The Sony Xperia Z4 will come with...

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