Microsoft's own official figures show that its Lumia sales have almost halved twice in recent quarters, falling from 4.5 million, to 2.3 million, and just 1.2 million sales in the second quarter of this calendar year. But according to Gartner, a total of 1.97 million Windows phones were sold during Q2 2016, which would mean that Microsoft's hardware partners sold almost 800,000 handsets, or nearly 40% of the platform's total sales (compared with just 100,000 sales during the previous quarter). Could that mean that Microsoft's strategy is working?