I have 2 virtual cards and 2 physical cards on my free Revolut account.
If I upgrade what happens to these additional cards and virtual cards?
Do they remain functional and unchanged?
Just my main primary physical card with the extra benefits is delivered/activated?
Nothing happens to cards. All benefits are applied to all cards. Subscription features affect accounts, not cards. Easy examples: the Metal cashback or ATM withdrawal limits work with all your cards, physical and virtual, as long as you’re subscribing to the plan.