More than half of U.S. companies say they have no formal BYOD (bring your own device) policy. Mobile security best practices have been promulgated by analysts and security firms for more than a decade. But there is apparently widespread variation about how companies implement security for BYOD workers. Only 21% of businesses are using multifactor authentication (MFA) to verify a user’s identity when granting access to critical enterprise applications and data. The value of allowing workers to use their personal smartphones and tablets while at work is now well understood by companies.”]