Nokia has reported $584 million in operating profit with $10.7 billion in net sales for the fourth quarter of 2012. In the previous quarter, the struggling handset maker recorded an operating loss of $754 million and $9.49 billion in sales. Overall, it sold 6.6 million smartphones, 4.4 million of which were Lumia devices. In Q3, it sold 2.9 million Lumia phones. [Source: Nokia]