Add AT&T GPRS APN

<wap-provisioningdoc>
    <characteristic type="GprsMgr" version="4.2" >
    <parm name="GprsAction" value="1"/>
    <parm name="GprsCarrier" value="1"/>
        <characteristic type="gprs-details">
            <parm name="ApnName" value="myATT"/>
            <parm name="ReplaceIfExisting" value="1"/>
            <parm name="MakeDefault" value="1"/>
        </characteristic>
        <characteristic type="att-details">
            <parm name="AttAccessPoint" value="wap.cingular"/>
            <parm name="AttUserName" value="WAP@CINGULARGPRS.COM"/>
            <parm name="AttPassword" value="CINGULAR1"/>
        </characteristic>
    </characteristic>
</wap-provisioningdoc>

Add T-Mobile GPRS APN

<wap-provisioningdoc>
    <characteristic type="GprsMgr" version="4.2" >
    <parm name="GprsAction" value="1"/>
    <parm name="GprsCarrier" value="2"/>
        <characteristic type="gprs-details">
            <parm name="ApnName" value="myTMobile"/>
            <parm name="ReplaceIfExisting" value="0"/>
            <parm name="MakeDefault" value="1"/>
        </characteristic>
        <characteristic type="tmobile-details">
            <parm name="TmobileAccessPoint" value="internet3.voicestream.com"/>
            <parm name="TmobileUserName" value=""/>
            <parm name="TmobilePassword" value=""/>
        </characteristic>
    </characteristic>
</wap-provisioningdoc>

Add Custom GPRS APN

<wap-provisioningdoc>
    <characteristic type="GprsMgr" version="4.2" >
    <parm name="GprsAction" value="1"/>
    <parm name="GprsCarrier" value="0"/>
        <characteristic type="gprs-details">
            <parm name="ApnName" value="myCustom"/>
            <parm name="ReplaceIfExisting" value="1"/>
            <parm name="MakeDefault" value="1"/>
        </characteristic>
        <characteristic type="custom-details">
            <parm name="CustomAccessPoint" value="apn"/>
            <parm name="CustomUserName" value="user"/>
            <parm name="CustomPassword" value="pass"/>
        </characteristic>
    </characteristic>
</wap-provisioningdoc>  

Remove Existing Named APN

<wap-provisioningdoc>
    <characteristic type="GprsMgr" version="4.2" >
        <parm name="GprsAction" value="2"/>
        <characteristic type="gprs-details">
            <parm name="ApnName" value="myTMobile"/>
        </characteristic>
    </characteristic>
</wap-provisioningdoc>

Remove All Existing APNs

<wap-provisioningdoc>
    <characteristic type="GprsMgr" version="4.2" >
        <parm name="GprsAction" value="3"/>
    </characteristic>
</wap-provisioningdoc>