1.6.1.24\themes\default-bootstrap\modules\blockcontactinfos\blockcontactinfos.tpl line 40
<span>{$blockcontactinfos_phone|escape:'html':'UTF-8'}</span>
to bellow it will call able no
<a href="tel:+{$blockcontactinfos_phone|escape:'html':'UTF-8'}">{$blockcontactinfos_phone|escape:'html':'UTF-8'}</a>
Thank you