<h4>点击下列链接拨打电话:</h4>
<a href="javascript:;" onclick="callMobile()">13120213658</a>
<style>
h4 { margin: 10px; }
a {
    display: block;
    padding: 5px 16px;
    color: #108ee9;
    text-decoration: underline;
}
</style>

<script>
function callMobile() {
    Mobile_NS.callMobile("13120213658")
}
</script>