A visitor uses his smartphone in front of an advertisement of Samsung Electronics' Galaxy S6 and S6 Edge smartphone at a Samsung Electronics shop in Seoul, South Korea, in 2015. Ahn Young-joon/AP hide caption

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Both Google and Samsung are rolling out new processes to issue security updates for Android devices, like the Samsung Galaxy S6 and S6 Edge. Jung Yeon-Je/AFP/Getty Images hide caption

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Under Pressure, Google Promises To Update Android Security Regularly
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Apple CEO Tim Cook speaks Sept. 9 during an event at the Flint Center for the Performing Arts in Cupertino, Calif., where he unveiled the Apple Watch. The device officially goes on sale Monday. Justin Sullivan/Getty Images hide caption

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As Apple Watch Launches, Taking Stock Of Competitors And Possibilities
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The Samsung Galaxy Mega (from left), Samsung Galaxy S4 and Apple iPhone 5 are shown. Apple is expected to announce larger models of its smartphone on Tuesday. Richard Drew/AP hide caption

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Size Matters: Why Apple Is Expected To Unveil A Bigger iPhone
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One of the earliest iPhone prototypes. This system was pieced together to test early versions of the iPhone's software. Courtesy of Apple hide caption

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From The Birth Of The iPhone To An Era Of Lawsuits
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Samsung Is On A Roll, But Can It Beat Apple?
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