Top wireless stories of the week

Check out this week's most-viewed stories across Fierce's wireless publications:

1. Sprint: We face problems if Clearwire defaults on loans
2. Sprint to introduce 3G connectivity for iPod touch devices
3. MetroPCS planning voice over LTE trials next year

1. Microsoft confirms Windows Phone 7 kill switch
2. Android poised to dominate app development in 2011
3. Google adds changelog for Android Market app updates

1. Google Search expands to Windows Phone 7
2. AT&T launches free trial to promote U-verse Mobile TV
3. Gartner: Android now powers 25 percent of all smartphones

1. Seybold's Take: The fallacy of unlocked phones
2. Top 25 Most Powerful People in U.S. Wireless 2010
3. Hesse attempts to dispel concerns over Clearwire's future

1. O2 UK CEO: 'Charge content providers for network traffic'
2. Telefónica to offer tailored M2M services
3. Femtocells: Developers co-op on dual-mode HSPA/LTE femto design