ThisCallButton is a free WordPress plugin by ThisCallButton.com that adds a click to call button on wordpress websites.
Visitors on your website are able to click on the call button to call your phone immediately through web browsers. No external devices/apps required.
You will need an account and a call widget API key at https://www.thiscallbutton.com, if you don’t have one you can register one on the website, it is free.
More info at: https://www.thiscallbutton.com