Can confirm US Xbox Live Cards off pcgamesupply.com work fine, just change the site region to US on account.xbox.com, add a US billing address...
Also, OP, can you just confirm one thing? If I plan to use a prepaid code and redeem it after I set my xbox.com to US whereas originally it is...
Hey mate, I've had an eye on this guide for a while and was waiting for someone to try it with a giftcard code :) So all worked out good for you?...
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