Referal how do I use my friend referral?

When i bought my Sim it asked to put a referral code. I entered a random one from someone on reddit. But I wanted to buy another one and it asked a referral code again. What does that mean? I read somewhere that when you activate your sim they ask for a referral code again? So is it when I activate my sim that I use this referral code? Anyone have some info ? thank you


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