The vast majority of mobile malware is written for. Thats a fact. Its a side effect of the open-garden. Anyone can write apps, even malicious ones, and distribute into the wild without the approval of a curation system.
But to the everyday user, does it matter? I have been looking for posts, on forums and social media, about people whose mobile device have been infected and need help. All I have found are blogs posts about Mobile malware, no personal stuff.
Charts and statistics can be misleading and the effect is massively intensified when you only refer to percentages rather than hard numbers.
People can come up with statistics to prove anything, Kent. 14% of people know that.
In my quest for hard numbers I found this article http://bit.skyjedi.com/1nnB6pu thats estimates mobile malware infections to around “11.6 million mobile devices” and “Android devices accounted for 60% [~7million] of total mobile network infections” I believe these numbers are world wide. At last count Android had crossed the Billion device mark http://bit.skyjedi.com/1xigELZ and activates 1.5 million devices daily. http://bit.skyjedi.com/1k0wIrz
With those number and a couple of others i made a chart of estimated Activated Android Devices compared to estimated infected Android devices. http://bit.skyjedi.com/TmFlaz The sheet with math and sources http://bit.skyjedi.com/TmGeQd
It is quite easy to avoid malware infection on Android. In a nutshell, don’t sideload apps [disabled by default] and the vast majority of people will never have to worry. If you decide to sideload apps http://bit.skyjedi.com/1k0wK2zhas a nice write up on how to keep yourself safe.