I really hope this doesn't happen. As I believe vodafone will either close down Smarty, or at least get rid of the free calls/texts part of it, and also get rid of the unlimited data plan. I might be wrong, but I can't see vodafone keeping something ...
I bought an S20+ 5G earlier this year, that was listed on amazon as renewed. However, it appears to be a brand new phone. It required several updates to android when setting it up, which suggests it was brand new.