BlackBerry on Tuesday made a play for security-conscious Android users with the announcement of its new DTEK50. Running Android 6.0 Marshmallow and BlackBerry security software, the new unit is the "most secure Android smartphone" in the world, the company claimed. Many Android users have concerns about the their phone's security, according to BlackBerry's April survey of 8,000 consumers between the ages of 34 and 54. Fifty percent of the respondents felt their phones were only somewhat secure, and only one in six knew about security patches.