Patents, not the next Angry Birds or having the best camera, are helping Microsoft tidy up in smartphones.
The amount of money Microsoft made on smartphones grew in 2012, but this was largely thanks to Android rather than Windows Phone.
In its latest SEC filing, Microsoft said Windows Phone revenue increased by $1.2bn in the year to 30 June, 2013.
But that number included an increase in "patent licensing revenue" in addition to sales of Windows Phone licences.
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