Generally, your working life, including everything that comes with it, is reserved for—well, work—including your laptop, phone, and such that your employer has provided for you. By contrast, your personal stuff is for your own personal use, and that's why it's—well, personal. There are very obvious things you should and shouldn't use each device for, and those things should be kept separate. Sure, these lines can blur and often will—after all, not everything is black and white.