Having said that, here is a little trick you can use to add a Click to Call link or button to your web sites or emails. While those using responsive sites and correctly designed emails have built in luxury, this might help those of you who just need to give a few places some mobile friendliness.
The following is the HTML markup for a click-to-call link. Just replace the 5555555555 with your phone number, using no spaces or dashes.
<a href="tel:5555555555">Call Us</a>
The same code can be used with an image in order to create a button, just replace the text Call Us with the HTML for the image you’d like to use.