Android's persistent fragmentation problem isn't just a Google problem, but a federal government concern too. A new study issued by the Department of Homeland Security (DHS) and the Federal Bureau of Investigation (FBI) says that Android devices expose US agencies to a significantly greater malware threat in large part because so many devices run outdated versions of the mobile OS. Of the malicious attacks documented in the study, 79 percent took place on an Android device. Meanwhile, Apple's iOS received just 0.7 percent of the recorded malware threats.

Symbian, the old mobile OS that Nokia has largely given up on, accounted for 19 percent of malicious attacks documented in the study. Windows Mobile and BlackBerry devices meanwhile each took a respective 0.3 percent of the malware pie, the study says. "The growing use of mobile devices by federal, state, and local authorities makes it more important than ever to keep mobile OS patched and up-to-date," the DHS and FBI advise. But, all too often, carrier politics and manufacturer policies mean that operating system updates and fixes aren't even an option for many Android devices.

Correction: This article original stated that Windows Phone was cited in the report. That was incorrect. The article has now been amended to read "Windows Mobile."