I've got a friend who received the SKY card a week ago after 2 weeks of waiting (it's been 3 weeks since the installation). The card covers 2 mixes (entertainment and music). She asks what is going to happen if she only initially inserts the card just before Christmas? Will she be billed any day now anyway for the first month with SKY, or will the billing start end of January if she puts the card in second half of December? How does it work?