title: Should TTY phone numbers be hyperlinked as normal numbers?
body: <p>Most site developers know to use the <code>tel:</code> syntax for phone number links to enable easy mobile dialing:</p>
  
  <pre><code>&lt;a href="tel:555-867-5309"&gt;(555) 867-5309&lt;/a&gt;
  </code></pre>
  
  <p>Should the same be done for <a href="http://www.abouttty.com" rel="noreferrer">TTY numbers</a>? Are there other or additional techniques that should be used for accessibility? </p>