Most Windows handsets in the U.S. still run Windows Phone 8.1

Microsoft must increase its efforts in getting Windows Phone 8.1 users to upgrade, as the older operating system's dominance will prevent the company from going through with its universal apps vision. According to data by AdDuplex, Windows 10 Mobile's market share growth has stalled in the last couple of months, with the operating system installed on just 15% of Windows mobile devices compared to Windows Phone 8.1, which governs 80% of Windows phones.

The low-cost Lumia 640 is the most popular Windows 10 Mobile device, followed closely by the Lumia 950. Meanwhile, recent Windows 10 launches such as the Alcatel Idol 4S and HP Elite x3 are at number #16 and #19, respectively. Alcatel has become the second most popular Windows 10 Mobile manufacturer after Microsoft, followed by HTC and BLU.

The Lumia 640 and Lumia 635 account for almost half of all Windows phones in use, with the rest being mostly older models such as the Lumia 521, 920, and 630. Most of them run on AT&T or AT&T-owned Cricket's networks. The Alcatel Idol 4S, which launched on T-Mobile, could increase the carrier's market share if there are enough sales.

Despite the anemic movements in the Windows market, Microsoft partner HP plans to launch a successor to the Elite x3 in early 2017. Reportedly, it will be a customer-focused smartphone at a more affordable price tag. Microsoft will be providing HP with technology used for Lumia phones in the past, such as Glance, ClearBlack display, double tap to wake, and advanced camera functionality.

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