It's funny that you say "green" because that is actually the corporate color of the company that has been providing me with cell phone service for the past 3 years: Cricket.

Unlimited airtime and unlimited text messaging for $52.50 including tax. That's been my price the entire time. Awesome, awesome company and service.

So there is competition, but it is tough to convince people to become a customer of your scrappy young upstart when "coverage" and "bars" are so important. People seem to worry that the service will be terrible. The reality of it is that I get great reception everywhere that I go and when I travel I get to Roam on Verizon's network for a really reasonable rate (I have thirty minutes of roaming airtime included with my plan and I can still send unlimited text messages!).

MetroPCS is another company who, like Cricket, also provides unlimited plans. If you have the means, and live within an area where they offer service, I cannot recommend them enough. It is so nice to not have to worry about overages or petty fees.