Cell Phone Rudness

Some of you know that one of my pet peeves is the almost constant use of cell phones by people while driving or shopping , dining , in line at the store etc. Does no one know how to say (I'll call you right back)? Well, it has gone beyond that now with them using them at the beach. This is beyond being inconsiderate, in my opinion.
While I was there recently, I had to just sit there and listen to this woman for two full hours while she talked on her cell phone and pranced back forth in front of me. I couldn't concentrate on my book.

How rude can she be?

If you know her, please tell herbe considerate of others!

VERY VERY IRRITATING ! ! ! !
This simply must stop!