Fortumo has taken another step in its building out its global carrier billing operations on Windows Phone and Windows 8 with the addition of subscription services in 83 countries.

Although not yet a typical business model for mobile gaming, it could be something that comes to the fore in the future.

It also gives Fortumo the opportunity to once again point out that from its data the average Windows Phone IAP transaction is $2.05, compared to just $1.44 for Android apps.

The third way

Of course, Windows Phone lags Google's OS massively in terms of global reach.

It has some regional density, however, with Brazil, France, Argentina, Italy and Vietnam being prime markets for Microsoft's mobile platform, not to mention the 24 countries where Windows Phone is apparently outselling iPhone. 

Indeed, the list of game developers who are working with Fortumo includes some names such as Game Insight, Joybits and Creative Mobile, which are based in Lithuania, Russia and Estonia respective, Chinese developers Happy Elements and Boyaa, and Indian studio Octro.

"Digital content merchants like Spotify and Hulu are struggling to enter emerging markets as the lack of credit cards in these regions results in only a fraction of people becoming paying users," said Fortumo's COO Martin Koppel.

"While Fortumo already helps app and game developers grow their revenue through in-app purchasing, subscription billing enables a wider range of developers to increase their payment coverage on Windows Phone & Windows 8."