T-Mobile's iPhone Sales Helping iOS Catch Up to Android in the U.S.

There doesn't exist a mobile platform more popular than Android, a statement that will probably ring true for a long time to come. Android has the most market share on a global scale, and it leads in the U.S., though if Apple's looking for signs of encouragement, it can point to iOS closing the gap (somewhat) domestically, according to data by Kantar Worldpanel ComTech.

Though the three-month period ending May 2013, Android claims the lion's share of the mobile market in the U.S. with a 52 percent penetration rate. Not terribly far behind is iOS, which is installed on 41.9 percent of smartphones, up 3.5 percent from the same period a year ago, Kantar Worldpanel ComTech says. And then there's Windows in a distant third with a 4.6 percent share of the smartphone market, though that's up from just 0.9 percent last year.

iPhone 5

Apple's decision to finally invite T-Mobile to the iPhone party is paying off.

"The highly anticipated release of the iPhone on T-Mobile has benefited iOS in the latest three-month period, though it has not yet impacted T-Mobile’s share in the market," notes Dominic Sunnebo, Kantar Worldpanel ComTech global consumer insight director. "Furthermore, of T-Mobile customers planning to change device within the coming year, 28 percent plan to upgrade to an iPhone for their next device."

That's good news for Apple as it looks to regain share it's lost to Android, though it remains to be seen how much it will actually benefit T-Mobile.