As of the latest research from Nielsen, we know the United States smartphone market has quickly become an iOS/Android duopoly with 90 percent of devices on either one of those platforms. While smartphone usage in Japan is still at 1-in-5 mobile phone owners, new numbers from comScore today show Japan’s smartphone market is also quickly becoming dominated by Apple and Google. To be specific, 95.6-percent of smartphones in the country are Android or iPhone, and Apple has outgrown Google in the last three months while Android’s share remains steady.

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• Game Over: Latest Nielsen survey says over 90% of US Smartphones purchased in last 3 months are iOS or Android (9to5google.com)
• AT&T activated 4.3M iPhones last quarter, over 78 percent of its smartphone activations (9to5mac.com)
• comScore: Android and iOS grab 80 percent US marketshare, Apple passes Motorola (9to5google.com)