The latest Windows Phone ecosystem statistics from the mobile ad provider AdDuplex show that Windows Phone 8.1 , which succeeded Windows Phone 8.0 in October, is now installed on 50.8% of all Windows Phone devices worldwide. That puts 8.1 in the majority!

The new numbers for the Windows Phone market were generated by data gathered from 5,005 Windows Phone apps running AdDuplex's SDK v.2 on November 24. Worldwide, the Lumia 520 remains the the single most used Windows Phone device. The 520 represented 26.3 percent of users in November, down just slightly from 26.9 percent in October.

However, the newer Lumia 630 is slowly but surely is gaining some ground in the market worldwide. In the US, the smartphone is close to overtaking the Lumia 520 for the second place spot, and its sister the Lumia 635 is not far behind.

Along with the known Windows Phone devices, AdDuplex's report also showed four currently unreleased hardware products running on the OS, all of which have the Microsoft or Nokia branding, which means they are all under the Microsoft Lumia brand:

Microsoft/Nokia RM-1069, RM-1070, RM-1071 – This one is a low-end 480x800, 4" phone seen mostly in Asia. Based on the resolution this looks like something with actual (non-software) buttons

Microsoft/Nokia RM-1072, RM-1075 – something mid-range with 5" 720p seen mostly in Finland;

Nokia RM-1078–480x854 (unknown screen size), seen exclusively on Sprint in the US

Microsoft/Nokia RM-1062, RM-1063, RM-1064, RM-1065 – that's a new 5.7" phablet and judging by the spread it isn't far from release. We've seen it in Finland, US (AT&T) and some Asian countries. But if you are waiting for a new flagship phablet you will most likely be disappointed. This one sports a 720p screen which makes it a likely follow-up to the Lumia 1320, not 1520.

Which Windows Phone device do you currently own?

Source: AdDuplex (Slideshare)