The ever-mathematical Horace Dediu has done his graphic wizardry to deduce the number of Lumia phones – the Nokia and Microsoft flagship Windows Phone 7… phones – sold in the US. According to Dediu’s math (which is typically spot-on) there are only 330,000 Lumia phones being used in the US. With 4 months of sales behind them, that puts the Lumia models at less than 100,000 devices sold each month.

[Source: Asymco]