It seems that Sony might have become a bit unhinged in its efforts to hunker down on its somewhat floundering mobile business. First, it rather quietly unveiled the Xperia Z4, which may or may not be limited to the Japanese market. And then there are whispers of an Xperia P2 that looks terribly similar except in a few areas. Now there is word that Sony might actually sell the Xperia Z4 in other markets as well, but quite appropriately name it as the Xperia Z3+ instead.

The revelation came from a whitepaper on a certain Sony SCR30 Style Cover Window accessory for the Xperia Z4, which has now been pulled down from Sony’s website. The paper names compatible products as the “Xperia Z4/Z3+”, hinting at two different names for the same device. Considering the quick disappearance of the document, there could very well be some truth to it.
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https://www.slashgear.com/sony-to-brand-xperia-z4-as-xperia-z3-in-other-markets-28381271/