5.2% of Windows Phone powered handsets are running Windows Phone 8.1
AdDuplex also revealed that while the Nokia Lumia 520 remains the most popular Windows Phone handset, it is beginning to lose market share. The "value" entry-level model (which will get updated to Windows Phone 8.1) has a 33.7% slice of the Windows Phone pie. It is a long way down to the next most popular Lumia phone. The Nokia Lumia 625 is next with a 6.7% share. With a 6.2% share, the Nokia Lumia 920 is third. Surprisingly, the T-Mobile exclusive Nokia Lumia 521 jumped from 11th to 4th, with a 6% market share of the Windows Phone platform.
In France and Poland, the HTC 8S is the third most popular Windows Phone handset. In the Czech Republic, that honor is reserved for the Nokia Lumia 800.