title: Font Awesome: Some icons not showing on mobile (iPhone iOS)
body: <p>I've upgraded to the new Font Awesome 5 because I had some trouble displaying some icons (ie Twitter Square and Facebook Square) on mobile devices. By upgrading I hoped to solve the problem, yet it didn't.</p>
  
  <p>I've upgraded to 5 and I've tried a lot to see what could be the problem. Even on JSBin the icon shows up on my computer, but not on my mobile device. I have an iPhone running iOS 11.2. </p>
  
  <p>This is the JSBin link where I tried to test it and reproduce the problem. I think the problem is within the Font Awesome source as I can't narrow it further much down I guess...</p>
  
  <p><a href="https://jsbin.com/zeruxafimi/edit?html,output" rel="nofollow noreferrer">https://jsbin.com/zeruxafimi/edit?html,output</a></p>
  
  <p>This is the code from the jsbin:</p>
  
  <pre><code>&lt;html&gt;
      &lt;head&gt;
          &lt;title&gt;Font Awesome Test&lt;/title&gt;
          &lt;link href="https://use.fontawesome.com/releases/v5.0.1/css/all.css" rel="stylesheet"&gt;
      &lt;/head&gt;
      &lt;body&gt;
          &lt;p&gt;This is the icon: &lt;/p&gt;
          &lt;a href=''&gt;&lt;i class="fab fa-twitter-square fa-3x"&gt;&lt;/i&gt;&lt;/a&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Anyone familiair with Font Awesome and knows how to solve this?
  Note: not all icons are not working. The envelope square icon for example works fine.</p>
  
  <pre><code>&lt;i class="fas fa-envelope-square fa-3x"&gt;&lt;/i&gt;
  </code></pre>
  
  <p>Thanks in advance.</p>
  
  <p>EDIT: I have tried to download the icons to my server and link them directly to see if that solved the problem but unfortunately not.</p>