That's the flaw right there. Don't mix company assets with pricate use. Phone, laptop, car. Your life is already very dependent on your employer (through income), don't get yourself locked in even more by depending on them for personal tech. Plus it's a security risk to your company.
Unless you have a low paying job, which rarely anybody on HN does, you can afford your own phone and laptop. And IT won't find your messages to girlfriend or pictures you don't want others to see or browsing history.