In a move that’s likely more geared toward carriers than toward customers, Yezz came to CES with two versions of the same phone. The Yezz Andy 5S will run Android 5.0 Lollipop when it launches next summer. It also has a Windows 10 twin.

The OS double-up may not mean that you get to choose which phone you want, unless you’re buying it directly. Rather, carriers will most likely pick the phone they want in their portfolio.
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https://www.cnet.com/reviews/yezz-andy-5s-and-billy-5s-preview/