diff --git a/phone.module b/phone.module
index 9979c2d..e0c8765 100644
--- a/phone.module
+++ b/phone.module
@@ -186,11 +186,48 @@ function phone_field_formatter_info() {
     'phone' => array(
       'label' => t('Default'),
       'field types' => array('phone'),
+      'settings' => array(
+        'phone_link' => FALSE,
+      ),
     )
   );
 }
 
 /**
+ * Implements hook_field_formatter_settings_form().
+ */
+function phone_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state) {
+  $display = $instance['display'][$view_mode];
+  $settings = $display['settings'];
+
+  $element['phone_link'] = array(
+    '#title' => t('Output as link'),
+    '#type' => 'checkbox',
+    '#default_value' => $settings['phone_link'],
+  );
+
+  return $element;
+}
+
+/**
+ * Implements hook_field_formatter_settings_summary().
+ */
+function phone_field_formatter_settings_summary($field, $instance, $view_mode) {
+  $display = $instance['display'][$view_mode];
+  $settings = $display['settings'];
+
+  // Display this setting only if field is linked.
+  if ($settings['phone_link']) {
+    $summary[] = t('Output as link');
+  }
+  else {
+    $summary[] = t('Output as plain text');
+  }
+
+  return implode('<br />', $summary);
+}
+
+/**
  * Implements hook_field_formatter_view().
  */
 function phone_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
@@ -200,9 +237,8 @@ function phone_field_formatter_view($entity_type, $entity, $field, $instance, $l
 
     if (isset($item['value'])) {
       $text = check_plain($item['value']);
-      // iPhone Support
-      if (strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone') !== FALSE) {
-         $text = '<a href="tel:' . $text . '">' . $text . '</a>';
+      if ($display['settings']['phone_link']) {
+        $text = '<a href="tel://' . preg_replace('/[^0-9+.]/', '', $text) . '">' . $text . '</a>';
       }
     }
     $element[$delta]['#markup'] = $text;