Add bootstrap icons next to fields in node page
Use the preprocess function, like:

function YOUR_THEME_preprocess_field(&amp;$variables) {
  $element = $variables['element'];

  if (isset($element['#field_name'])) {
    if($element['#field_name'] == 'field_business_phone') {
      foreach ($variables['items'] as $k =&gt; $value) {
        $variables['items'][$k]['#markup'] = '&lt;span class="glyphicon glyphicon-earphone list-icon"&gt;&lt;/span&gt;' . $variables['items'][$k]['#markup'];
      }
    }
  }
}


Or overwrite the field templates, in a file named field--field-business-phone.tpl.php, containing something like:

&lt;?php

&lt;div class="&lt;?php print $classes; ?&gt;"&lt;?php print $attributes; ?&gt;&gt;
  &lt;?php if (!$label_hidden): ?&gt;
    &lt;div class="field-label"&lt;?php print $title_attributes; ?&gt;&gt;&lt;?php print $label ?&gt;:&amp;nbsp;&lt;/div&gt;
  &lt;?php endif; ?&gt;
  &lt;div class="field__items"&lt;?php print $content_attributes; ?&gt;&gt;
    &lt;?php foreach ($items as $delta =&gt; $item): ?&gt;
      &lt;div class="field__item &lt;?php print $delta % 2 ? 'odd' : 'even'; ?&gt;"&lt;?php print $item_attributes[$delta]; ?&gt;&gt;&lt;span class="glyphicon glyphicon-earphone list-icon"&gt;&lt;/span&gt; &lt;?php print render($item); ?&gt;&lt;/div&gt;
    &lt;?php endforeach; ?&gt;
  &lt;/div&gt;
&lt;/div&gt;