As others have said, promo codes are only good for new account signups, but you do get full credit for any prepayment on your previous plan (less the monthly pro-rated amount).
Thinking about it, people would be able to take advantage of two or more promotion codes if they allowed promo codes on upgrades.
Hmm, unless they only allowed it for accounts that hadn’t previously used a promo code… But then since you can drop down in service they’d have to figure out how to prevent people from upgrading using a promo code, then downgrading again. Ah, the problems of a frictionless economy!
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