Can I upload ringtones to my Virgin Mobile USA handset or download them from another web site to my handset?
From HowardForums Wiki
The uploading of ringtones is not supported on Virgin Mobile USA handsets. Ringtones could be uploaded to some early handsets models using BitPim software and a USB cable, but this capability was disabled in all VM handsets sold after 2005.
The only supported sources for ringtones on Virgin Mobile USA handsets are virginmobileusa.com and jamster.com. Both sites sell ringtones, either individually or in bulk quantities.
Update. Some handsets come preinstalled with opera mini four which when updated to opera mini five gives the phone capabilities to download anything online with the exception to .jar and .jad files.