Smartphone face-off: iOS 5 vs. Android 4 vs. Windows Phone 7.5 vs. BlackBerry OS 7

iOS 5, Android 4 "Ice Cream Sandwich," Windows Phone 7.5 "Mango," and BlackBerry OS 7 were all released in the past few months, each promising to advance the iPhone, Android smartphones, Windows Phones, and BlackBerrys respectively to the head of the mobile pack. But only one can be the best.
InfoWorld has tested each of the major mobile OSes on the flagship devices for each OS to see what the best smartphone is for business and professional users. The answer is without a doubt the iPhone 4S, thanks to iOS 5, the Apple ecosystem, the smartphone's solid hardware, and the new Siri voice-controlled "intelligent" assistant. But as good as the iPhone 4S is, it does not beat the competition in every respect, showing it has room for improvement and that Apple doesn't excel at every aspect of modern mobile computing.
[ Learn about consumerization of IT in person March 4-6, 2012, at IDG's CITE conference in San Francisco. | Get expert advice about planning and implementing your BYOD strategy with InfoWorld's 29-page "Mobile and BYOD Deep Dive" PDF special report. | Keep up on key mobile developments and insights with the Mobilize newsletter. ]
BYOD and Mobile Deep Dive
For the deep details of each of the major devices, read our full reviews, as this comparison focuses on the highlights and lowlights of each platform's flagship smartphone:
You can also calculate personalized scores for all of these devices by entering your own weightings for each review category in InfoWorld's smartphone calculator.
Test Center Scorecard


20%20%15%20%15%10%
Apple iPhone 4S9810899
8.8
Very Good

20%20%15%20%15%10%
Motorola Mobility Photon 4G877788
7.5
Good

20%20%15%20%15%10%
RIM BlackBerry Bold 9900785966
7.1
Good

20%20%15%20%15%10%
Samsung Focus S756587
6.2
Fair

20%20%15%20%15%10%
Samsung Galaxy Nexus878779
7.6
Good

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