So, which is the current mobile operating system that is secure?

All have benefits and drawbacks.

Currently Windows Phone seems to be the hardest nut to crack.

Windows Phone Is the Most Secure Mobile Platform

Blackberry has a long history of being very security-focused.

If I have physical access to the gear, I find Androids usually the easiest target.

Then comes iPhone, then older versions of BlackBerry.

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A smartphone running Windows Phone 8 or newer, too would be a good choice.

source: www.techworm.net