put-group">
    <span class="input-group-addon">@</span>
    <select class="form-control selectpicker">
      <option>One</option>
      <option>Two</option>
      <option>Three</option>
    </select>
  </div>

  <hr>
  <div class="input-group">
    <span class="input-group-addon">@</span>
    <select class="form-control selectpicker" data-mobile="true">
      <option>One</option>
      <option>Two</option>
      <option>Three</option>
    </select>
  </div>
  <p>With <code>data-mobile="true"</code> option.