title: Check if <a href="tel:5555555"> is supported
body: <p>Is it possible to check if a phone number hyperlink is supported by a browser?
  EG: Check if </p>
  
  <pre><code>&lt;a href="tel:555555555"&gt;Call us on 555555555&lt;/a&gt; 
  </code></pre>
  
  <p>will work.</p>
  
  <p>I'm trying to avoid the "Cannot open page. Safari cannot open the page because the address is invalid." type messages on things like iPod/iPad etc.</p>
  
  <p>Thanks.</p>