First, he says that the key measure of browser usage is actual browser activity, or pages viewed.

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Its 13% share of world browser usage is startlingly high considering that to run Firefox you have to find the Firefox Web site and download the software yourself.

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The biggest reason, it turns out, for the vast disparity in browser usage between Android and iOS, is how many low-end Android devices there are out there in the hands of users with little motivation to upgrade.

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Also, text to speech function offers voice guidance for convenient usage of the web browser.

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But for the purposes of determining which browser is most used, and most important, usage makes the most sense to Mr. Cullen.

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"It was the first phone with a really good mobile Web browser, and we saw five times the average usage of things like Google Maps and YouTube" compared with online habits, says Vic Gundotra, Google's head of mobile developer relations.

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Battery power consumption depends on factors such as network configuration, signal strength, operating temperature, features selected, vibrate mode, backlight settings, browser use, frequency of calls and voice, data and other application usage patterns.

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