add call button to html page code example
Example 1: html telephone link
<a href="tel:1234657890">Call (123)456-7890</a>
Example 2: html telephone
<a href="tel:0612345678">Call me!</a>
<a href="tel:1234657890">Call (123)456-7890</a>
<a href="tel:0612345678">Call me!</a>