If you use a company-supplied PC on a corporate network and carry around a company smartphone, you're almost certainly being watched. But with a bit of forethought and these tips, you can enjoy a little digital liberty in the workplace.
If your company issued you with a smartphone, don't assume that anything you do with it is private. Tracking everything from calls and text messages to apps installed is a trivial task for your IT department, and with mobile security gathering increasing attention of late, chances are good that your device's network activity is at least showing up in a log somewhere.
Even if you're not a total slacker, it can be a good practice to carry your own smartphone for personal use. Besides, doing so will give you the advantage of having an untracked device and network connection as mentioned earlier.
In the grand scheme, of course, there's no such thing as online privacy. And although I know it's none of my business what you do with your time at work, it actually is - both literally and legally speaking - your boss's business. So don't blame the company for wanting to track your computer use. With that said, however, I don't blame you for wanting to loosen the leash a little from time to time. Just use your best judgment, and don't get yourself into trouble.
See also: How Facebook mucks up office life