What if I am in us and bought the card in the us?
How to redeem a gift card bought in the us and I live in the us and bought my phone in the us
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If your Apple ID is also registered for the US, you should be able to redeem the iTunes gift card.
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Code must be redeemed in a different country or region
If you see a message that says the code must be redeemed in another storefront, the card was probably purchased in another country or region. You can't redeem Apple Gift Cards or App Store & iTunes Gift Cards outside of the country or region of purchase. For example, if you bought an App Store & iTunes Gift Card in France, you can't redeem it in the App Store in the United States.
If you need more help, contact Apple Support.
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copied from: If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support