title: Phone number with letters - click to call
body: <p>Is it possible to have a phone number that contains letters (for effect) be recognized by mobile devices, and ONLY mobile devices, as a click-to-call number?</p>
  
  <p>The client is a CPA and they happen to have 4CPA as the last 4 digits and this is really important to them... but what is important to me is that this website is usable.</p>
  
  <p>I found this question:
  <a href="https://stackoverflow.com/questions/6439777/how-to-detect-a-mobile-device-in-a-web-page">How to detect a mobile device in a web page</a></p>
  
  <p>but I am not sure how to implement the PHP nor write the PHP to fill in the if/then.</p>
  
  <p>(I was hoping to do this without PHP.)</p>