I'm using Dynamics 365 v8.2 and Dynamics 365 for phones (Mobile app)
HTML WEBRESOURCE:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "www.w3.org/.../xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script src="ClientGlobalContext.js.aspx" type="text/javascript"></script>
<script src="smsmt_/Scripts/Contact/ContactForm.js" type="text/javascript"></script>
</head>
<body>
<div class="divImage">
<img src="...image src" alt="Click To Call" id="WebResource_ClickToCall" style="float: left;" />
</div>
</body>
</html>
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