hey i got an iphone from ebay but it does not have the orginal sim card. I have jjailbroken the iphone but it wont accpect my o2 Uk pay as you go sim card. Even though o2 cards work.

Do i need the iphone tarrif o2 sim card that came with th phone so i can use my pay as you go card?

And if so where can i get one from?