Help APN settings via XML download

[Android Question]

I'm trying to create a web-site where users of Android phones (Samsung, HTC and other popular brands) can download a APN settings file, such as:

<?xml version="1.0" encoding="UTF-8"?>
<wap-provisioningdoc>
<characteristic type="BOOTSTRAP">
<parm name="NAME" value="MyMobileBrand"/>
</characteristic>
<characteristic type="NAPDEF">
<parm name="NAME" value="MyMobileBrand"/>
<parm name="BEARER" value="GSM-GPRS"/>
<parm name="NAP-ADDRESS" value="internet"/>
<parm name="NAP-ADDRTYPE" value="APN"/>
<parm name="PPP_AUTHTYPE" value="PAP"/>
<parm name="INTERNET"/>
</characteristic>
</wap-provisioningdoc>

I've tried to simply create a download link, but it (of course) just download the file, and aren't actually setting the APN settings on the phone.

Am I on the right track, and what am I missing? And are most Android phones using the above XML format for APN settings?