Below is a link that tracks cell phone laws by state.  I would recommend that any company with a fleet check this out, and, if you have locations in multiple states, you may have to amend your fleet policies by state.  

Your policy should simply be ‘Don’t’ – but if you depend on state laws, here they are.

Here is the link:

http://www.iihs.org/iihs/topics/laws/cellphonelaws