struts2 tags problem

Hi all, a have a problem related to struts2 tags.
in my jsp page i have something like :

Code:

---


  <s:property value="location.outboundPrefix" /><s:property value="phones[0].phNo" default=""/>
                       
                            <s:if test="phones[0].phoneType == 1">
                                <s:url action="sms.html" id='smsUrl'>
                                    <s:param name="pid" value="phones[0].id"></s:param>
                                </s:url>
                                <s:a href="%{smsUrl}"> SMS</s:a>
                            </s:if>
// and

  <s:property value="location.outboundPrefix" /><s:property value="phones[1].phNo" default=""/>
                       
                            <s:if test="phones[1].phoneType == 1">
                                <s:url action="sms.html" id='smsUrl'>
                                    <s:param name="pid" value="phones[0].id"></s:param>
                                </s:url>
                                <s:a href="%{smsUrl}"> SMS</s:a>
                            </s:if>

---

the problem is that phones[1] does not exists in all cases, so when it is not set i got a IndexOutOfBounds exception.
How can i test if phones[1] exists in order to prevent this ?