Actually looking more into this I have just implemented it quickly to my site via mobile. Needs some work but I added <div class="right"><a href="whatsapp://send?text=JustATest"><img src="//phoneunlockserver.com/images/whatsapp.png"/></a></div> To my mobile skin after {parse template="defaultHeader" group="global" params=""}
</if>I think it's better than relying on external websites and javascript