According to the latest data from AdDuplex's mobile advertising network, the entry level Nokia Lumia 520 handset currently accounts for 27% of all Windows Phone 8 models being used; throw all Windows Phone models into the equation and the Nokia Lumia 520 still accounts for a rather hefty 18% of Windows Phone units in use today...Source: http://www.phonearena.com/news/Nokia-Lumia-520-owns-27-of-Windows-Phone-8-market-model-numbers-leaked-for-Nokias-phablet_id46507
