By getting Windows Phone on all of the major carriers, Microsoft can begin to sell developers on Windows Phone 8. This chicken egg story has bothered them for years now. Users will not buy a product unless it has tons of apps. It is irrelevant if many of them are so-so, numbers matter. Also, it really matters if the top tier apps are on that platform. Windows Phone has been mostly on GSM providers like T-Mobile and AT&T. It has been on Verizon, but handset selection was either small or not well received. Now that Sprint has joined in, the potential customer base has grown. Windows Phone now has a presence on all of the major players (T-Mobile merged with Metro PCS), and it is now a far stretch to possibly see Windows Phone on carriers that user Sprint’s network (Boost, Virgin).

This is a good development for the platform and continues the good news for developers and consumers that started with the changes to the operating system. Windows Phone 8 kernel based on Windows 8 instead of Windows Compact Edition (CE). Windows Phone 8, like Android, can now support hardware from low end to high end spec wise.

http://www.pcworld.com/article/2043040/windows-phone-8-to-land-on-sprint-this-summer.html