Referal code when ordering SIM

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Hi :)
I'm new to fizz, I created an account and I have a referal code from a friend. I will be getting a mobile service.
I have to order my SIM card, but is it when you order your SIM card that you put in the code?
Or you put it after you physicaly got the card?
Or once you purchase the SIM card you can activate it right away?
I know a box will appear but I really don't want to miss it lol!

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