I know a few people purchased these, I just got it for the DAB radio and for tv when away.
Anyway, I put in one of my new sims on this as it is only a spare and want to use up the free credit, and guess what, you get another 3 months free TV.
I spoke to a guy as I was having trouble downloading the licence and he said that I could use my 4 other spare cards and get 3 months free with each.
So, £5 credit and TV for 3 months with each free sim.
He also said that if you want to keep your number, just use the new sim to download the licence, then swap back.