Suspect that some of your mobile phone-toting users have infected themselves with dangerous and insecure apps? A quick check of corporate phone bills could be a suggestive source of evidence.
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The most recent report on mobile security from McAfee highlights the rise in Android apps which try to furtively sign customers up for premium SMS services. In 2012, 16 per cent of the mobile malware families analysed by McAfee included mechanisms designed to force premium SMS sign-ups. That number is expected to rise in 2013, though basic spyware will remain the dominant technique.
Preventing those kinds of issues requires a multi-part approach, including educating users on checking app permissions and installing mobile security software to flag risky downloads. That said, if corporate phone bills seem much higher, a smartphone problem might well be the cause.