if they provision it on 6th (or 7th) December, that's when the 12 months starts.
Even tho' it is still normally free until 4 Jan? Why should you pay, with a tie-in contract, for something that is still free for nearly a month?
You end up buying just over 11 months free Caller Display in exchange for a 12 months contract.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC