What does the plugin do? This plugin places a Call Now button (click-to-call) to the bottom of the screen which is only visible for your mobile visitors. Because your mobile visitors are already holding their phone it will allow them to call you with one simple touch of the button. No more complicated copy-and-pasting or memorizing the phone number! Could not be easier! The settings are very easy: enable and enter your phone number. That’s it! But if you want more control, you can always open up the Advanced Settings and change the default behavior. Only for mobile optimized themes Usage at this point is only for responsive websites (websites optimized for display on mobile devices).