> Apple's Cook hints at prepaid iPhone, shaking up handset distribution.
> Smartphones, tablets drive U.S. mobile data revenues to $55 billion in 2010.
> China Unicom takes on iOS, Android with Wophone mobile OS.
> Angry Birds descend on Windows Phone 7 this spring.
> Mobile gaming startup TinyCo raises $18 million in Series A.
And finally... Eight-year-old arrested. For the fifth time.