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Usage:
AKC/contact

Description:
This code allows you to take a number field with 10 digits and no spaces created in an acf, and output it with an a-tel link with country code so it id dial-able on mobile.

<?php if( get_field('phone_number') ): ?>
                  
  <!-- GET phone_number value in variable -->
  <?php
    $phone_string = get_field('phone_number');
    $formatted = "(".substr($phone_string,0,3).") ".substr($phone_string,3,3)."-".substr($phone_string,6); 
  ?> 
  <li>
    <a href="tel:+1<?php the_field('phone_number'); ?>">
      <i class="fa fa-phone"></i><?php echo $formatted; ?>
    </a>
  </li>
  
<?php endif; ?>