Voice-activated security is a staple of Hollywood movies. In the real world, though, it's not quite as effective as you might think.
Voice recognition tech is so vulnerable to hacking and exploitation, in fact, that security researchers recommend disabling your smartphone or tablet's voice features ASAP.
In an interview with Forbes, Yuval Benn-Itzhak with security firm AVG had this to say:
“Microphones should be disabled immediately and our current recommendation is that the user switch off features [involving voice commands]. At the moment, leaving biometric technology as it is today is like leaving a computer without a password and just allowing anyone to walk by, click and take an action."
Burglars with enough technical know-how could, according to Benn-Itzhak, bypass your gadgets' security without having to guess a password or break out a virus.