Experts reveal sneaky way your phone listens in on your conversations - and how to stop it

It was long thought to be a myth and dismissed by big tech companies. But experts have revealed how listening into your conversations has become a multi-billion dollar industry. Earlier this week, a leak from a leading marketing firm appeared to confirm how companies use microphones on your smart devices to eavesdrop before selling the data to advertisers. 'You can be talking to one of your friends about going on a vacation to Portugal through a phone call, and then a day later or that same day, what do you see? An advertisement for a trip,' data security expert Andy LoCascio told DailyMail.com.