Being dragged by a friend to see Black Swan was indeed worth it when you see those two go at it!
I don't know if the code is attached to the number, I did it with my old Orange phone which I got rid of the contract for, I suppose I'll find out if anyone ever gets my old number!
Was a bit worried as after all that gloating about the app, a week later my phone died and I had a new handset supplied. Luckily though the iPhone backup was all saved and reinstalled and I didn't need to revalidate the app!