Yes, because your company has no business need to know who you call or what you do with your own phone on your own time. Plus, if the company does something that causes any investigation, you lose your phone while the investigation goes on, and may never get it back. Since it was your personal phone, I hope you didnt have any contacts, pictures, etc that you really wanted.
"Still, BYOD requires a great deal of attention to security. As Cruz explained, BYOD users would have to agree to have DHCSs mobile device management software installed on their mobile devices, creating a partition between business and personal data, and enabling DHCS the ability to wipe it if it were lost or stolen. As Cruz explained, DHCS mandated to have all mobile devices encrypted."
So if you are like many households and you dont have a land line, if something happens and your spouse or kids need to use your phone in an emergency, do they know your encryption password to make a call? Are you okay with your company knowing everything you do on your own personal computer when you are not at work?
Some people may agree to this because they havent been able to get a job for months, but most people would run away from a company trying to do this. And think of this. You are in a company that deals with HIPAA data or CC data, and a leak happens, the company will now try and share the blame and penalties with all the employees. So you may have done nothing wrong, but since the company policy is that all employee used machines have company data on them, they are company assets.
Not to mention, how do you now support practically any device out there coming in? Win XP to Win 8, multiple versions of MAC OS, Linux, etc.