Are you using your own smartphone at work? If so, you're not alone -- by 2017, Gartner predicts that half of employers will require employees to supply their own device for work purposes. But what happens when you quit or get fired? If you're using your own device for work, you'll undoubtedly have months, if not years, of personal information on that phone -- including photos of loved ones, texts between friends, and other (very) personal information. You could lose all of that, along with access to your corporate accounts.