Research firm Kantar Worldpanel has released a new report (via The Next Web) highlighting U.S. smartphone sales over the March-May period, finding that Apple's share of the market rose by 3.5 percentage points compared to the prior-year period. The report attributes that growth to the iPhone becoming available on T-Mobile USA, the last of the four major U.S. carriers to begin offering the device.Consequently, with Android remaining unchanged (+0.1%) to date this year, the gap between the two leading operating systems has decreased, according to data released today by Kantar Worldpanel ComTech. Through the 3 month period ending May 2013, Android continues to lead smartphone sales at 52%. Close behind is iOS wit
