You can also review the all important To S and refund policies before starting the trial.
If you’re looking for a comprehensive explanation of how various calls to action work, you can’t do much better than this PDF guide by Hub Spot.
Below I’ve divided the calls to action into groups of what I deem their most significant characteristic with a brief explanation of how and why those features are important.
The Dropbox homepage appears almost empty (above the fold) except for the call to action.
This example of the Optin Skin Word Press plugin draws attention to the social buttons. The Skype button uses contrasting colours and positioning to help it stand out from the rest of the page content.
You’ll also notice that the woman’s line of site is directing your attention to the entry form.