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South African iTunes gift cards purchased from the iStore, Pick 'n Pay, Makro, or any other retailer in South Africa CANNOT be used on the US iTunes store or for a US iTunes account.
The opposite also applies. US iTunes gift cards CANNOT be used on the South African iTunes store or for a South African iTunes account.
This limitation applies to all purchases including in-app purchases.
We sell iTunes gift cards for the US iTunes store that can only be used with a US iTunes account.