Your smartphone - or tablet - knows a lot about you. It's packed with your contacts, emails, photos, texts and browsing history.
You probably have it set to log in to your Facebook or Twitter app automatically. If you shop or bank on your phone, it's probably holding your account logins and credit card numbers.
In other words, you want to keep other people as far away from it as possible. Just thinking about someone else on my phone and what they could do with the information in it gives me the chills.
Unfortunately, and I'm sure you know this, friends and family like to snoop, thieves have no trouble walking away with gadgets in public and hackers are getting better at making malicious data-stealing apps.
You don't have to put up with any of it, though. Keep reading and I'll tell you how to lock down your iPhone, iPad, Android gadgets or Windows phone so that snoops and criminals don't get their hands on your valuable information.