I was asking my neighbors. 3 of them have Fritzboxes provided by Vodafone.
Their online monitors are showing DS-Lite.
I have my own Fritz!Box. I have a IPv4 address, but it is not a static one. The connection has been renewed two days ago.
I remember in our former apartment I was checking the IP from time to time. It was also non-static, but it was always the same. We moved there in 2002, so the situation today with the lack of IPv4 addresses is different.
I slept on it one night and I decided not to test the Vodafone FB. Never change a winning team!
But maybe my findings are helpful.
If I would have a Vodafone FB and DS-Lite I would try to get a second hand 6490 on Ebay Kleinanzeigen to check if I would get a IPv4 address. If yes I would buy a 6690 and sell the 6490 again.