Voicemail, Google Voice and iPhone


Anyone know how to get voice mail from Verizon to Google Voice? My sister has a bunch of saved messages, she is getting an iPhone and you apparently lose your saved messages. Figures. So we tried forwarding them to my GV and they don't get there. She did forward them to my Verizon number (I turned forwarding off) but I would like to get them to GV so I can email the files back to her??? I guess if worse comes to worse I can forward them back to her Verizon after the iPhone is activated?? UGH.
Any ideas/solutions?