Good news here!!  Lumia 810 which is exclusive to T-Mobile in USA is currently the “Best Seller” smartphone on the carrier as shown in the above screenshot. As we know out of all three Lumia 820 variants, Lumia 810 had been the most expensive ($149, even more expensive than Lumia 920 on AT&T) from start and perhaps that was the reason it didn’t generate as much sales as compared to Lumia 822 at Verizon. But, now T-Mobile is pushing it aggressively and this strategy is bearing fruits as well !! T-Mobile has dropped the price of Lumia 810 to Free in web-only offer. This offer is valid through 21st January now.