Know-How Exchange : Copywriting

I have a Revolutionary idea that could enable either Verizon or At&t to control entire cellular service provider market. However I do not know the best way to inform either company of my idea. I do not know the best way to protect my idea because it is not a new product but a new form of advertising. I am also unsure of the best way to inform either company of my idea to ensure that I will profit from it. I am fully prepared to do all necessary research and development, however since my idea would be most profitable to a corporation that already has a large customer base I am confused as to how I can personally present my idea to any cell phone service provider corp. and earn my share of the profit they receive from my idea. Any Advice? Thanks!