(Sorry for the second post - forgot to include something.)

I believe that the person (whom your meeting with) is THE most important, or biggest, item of concern, at that moment, and that THAT person requires all of my attention.

I am very put-off by persons with bad cell phone etiquette and as far as I am concerned, a person (trying to set a good first impression) should never:
a). place their cell phone on the table (whatever surface you're gathering around)!
b). allow their phone to disturb the meeting - ensure its ringing or vibrating can NOT be heard. Turn it off; go direct straight to voice-mail etc.
c). answer their phone (unless it is important to the meeting).
d). phone somebody (unless it is important to the meeting).

You've just shown the person how little you think of them &/or their time! (I hold similar beliefs for cell phone use in general.)