Mendelevich has some other important data to pass along. For example, the low-end Nokia Lumia 520 now has 30% of the Windows Phone 8 market, confirming the model's dominance in that niche of the Windows Phone market. And thanks to the T-Mobile Nokia Lumia 521, pre-paid carrier MetroPCS is now responsible for 5% of Windows Phone 8 carrier revenues in the U.S. The budget priced model is now the second largest selling Windows Phone model in the states, surpassing the Nokia Lumia 920. HSN recently had the Lumia 521 up for sale once again. This time, using a coupon code, you can purchase the phone off contract for a mere $80.
One final stat from AdDuplex. 30% of Windows Phone 8 devices have the GDR2 update. That update brings Data Sense to Windows Phone 8 models along with a number of other features. Data Sense allows the phone's user to keep track of how much data a particular phone has consumed for the month to date, which apps are responsible for the consumption of the most data, and reminds you when your month ends so you can be very careful not to go over your monthly data cap.
source: @ailon via WMPoweruser