CREDO Mobile is a cell phone company owned by Working Assets that allows the user to donate to an organization of their choice every time they make a call. There is a long list of groups that you can support through the company, covering civil rights, economic and social justice, peace and international freedom, the environment, and voting rights and civic participation.
I love seeing new ways to make effortless changes. How hard is it to sign up with CREDO verses Verizon or Sprint? Unfortunately, at the moment the coverage isn't as good as the more well-known companies (I was disappointed to see my area not yet covered). However, maybe the advancement of companies like this will encourage the big-name corporations to start making changes.