Since voicemail forwarding is not supported by virgin mobile, you will still occasionally get voicemails to your virgin number if your Google voice number fails to redirect back to it's own voicemail. You also need to remember to let it ring until it goes to voicemail. You can hit the volume buttons to silence it, but do not slide the slider to the left or up. These will both send the call to your virgin voicemail as it takes a full thirty seconds for Google voicemail to kick in.