* Purchasing phones for employees is often a losing strategy. Many employees won't carry, charge, share the number for or use company cell phones.

* Supporting every major brand of user-purchased phones with backend encryption, security and data access capability is a needless cost and time-sink for many companies.

* Company data stored on phones is a risk no matter what. Phones are lost, stolen, synchronized and shared, and data residing on local storage is vulnerable.

* The psychological wall between work and personal time is gone. People work at home, and do personal tasks at work. You can create user policies and train until you're blue in the face, but users will still use their cell phones to socialize, play, browse and shop from the office.

* Social networks cross all barriers. Employees have access all the time. Twitter requires only SMS. Facebook is accessible on phones.