cell phones and the work place

I think my uncle may be the last adult on the planet without a cell phone. Cell phones are everywhere but do they belong in the work place. It depends on the job. As much as I am attached to my phone, when I worked for an outside organization, they paid me for my time and attention, I believe I owe my full attention, not me trying to text or checking voice mail while doing your job. There is one more reason some companies have banned cell phones, to protect products in the pipeline. It is very easy to take a picture of the computer screen or a proto-type of a product with a camera phone and whose to say its not getting into the hands of the wrong people.