T637 I have the T637 and it works fine with my 2004 Prius #9. The only issue is since the T637 stores multiple numbers per person, when you try and send a contact to the car to store, it will send the first number for that person.
Just a heads-up: I have an Ericsson t610 and I encountered an odd phenomenon. I had my GF's cell phone in it's own little entry, and it was the only entry that didn't get transmitted over to the Prius when I uploaded the phone book. I also tried to upload the entry by itself, and it didn't work. I couldn't figure it out... there was only one entry (cell phone), it would connect, transfer and say it was successful but nothing would show up... It turns out the problem was in the phone.... sort of. I had the picture caller id set up for that contact. You know, where if the person calls, it displays a picture of your choosing. As soon as I deleted that association, the contact transferred just fine. YMMV
