WoW - Guest Pass + Free Month?

[Sinque]

I've just bought WoW - again. I was wondering, since I got a guest pass with this one, if I could use the guest pass for the first 10 days then enter my game serial then get the month free?

Or does it not allow this?

 

[Sinque]

Did you sell your old account ?

Don't be so silly! That's illegal